ALADIN User's Manual
Contents
1. j d ri Aladin 2 0 f 1 66 x1 66 m a v E ML je ee E AR fe at Eit Nue is 1 p i SS Der RN E N lo zh uU x z a pu SN z2 o Boxlz tu iu 7 rai i 2 SOE call 4 AN PN 0 z 3 n ix gt 9280102063 10 60857 41 09652 10 63 16 0 0 2 0 40 i 0280102003 10 55250 41 09932 13 02 16 0 0 2 0 40 gt 0280102085 10 74932 41 10039 12 00 16 0 0 2 0 40 0280102088 10 58403 41 12970 12 46 16 0 0 2 0 40 9280102030 10 73371 41 13640 12 34 16 0 0 2 0 40 c ULP CNRS 1999 2004 Centre de Donn es astronomiques de Strasbourg Fig 21 Low resolution image of M31 the field size is 1 6 image from DSS I Highlighted symbols in the display green square show selected objects for which the data from GSC and Tycho 2 are displayed in the Measurement window A filled blue triangle in this window signals the GSC entry closest to the cursor Telescope Institute for the needs of the Hubble Space Telescope To create the DSS I images the STScI team scanned the first epoch 1950 1955 Palomar Red and United Kingdom Schmidt J Blue plates 1980 including the SERC J Equatorial Extension and some short V band plates at low galactic latitude with a pixel size of 1 7 arcsec 25m Images are slightly compressed factor of 10 DSS II images in the R band come from Palomar POSS II F and the UK Schmidt SES AAO R and SERC ER scanned with a 1 arc2. 8 2 3 Local Tables Tables should be in one of the following formats Tab Separated Value TSV one record per line each field separated by a TAB By default the first column is assumed to be Right Ascension and the second column Declination both in J2000 equatorial system Values are to be given in decimal degrees or in sexagesimal hours and degrees Heading line can be present as shown below RAJ2000 DEJ2000 GSC number Pmag 185 701 15 822 0144501972 Ee Teie 195 706 154 795 01445025307 13492 185 704 15 844 0144501918 15 410 185 710 15 849 0144502383 14 78 XML The VOTable XML format is developed by the International Virtual Observatory in Astronomy IVOA It allows to describe astronomical catalogues with XML Aladin uses it to retrieve data from VizieR Simbad NED or to load local data files The VOTable for mat is detailed at the following address http vizier u strasbg fr doc VOTable Aladin also supports AstroRes the predecessor of VOTable Astrores format is detailed at the following ad dress http vizier u strasbg fr doc astrores htx 8 3 Saving and Printing It is possible to Print a postscript version of the main View Fig D3 Different options are offered to Save data from an Aladin session The work session can be saved in a proprietary Aladin Java AJ format for future re use Catalogues or images loaded in the plane stack can be saved respectively in ascii or fits formats A fil
3. ttp vizier u strasbg fr viz bin Cat Tycho ttp vizier u strasbg fr viz Daniel Egret Francois Bonnarel Pierre Fernique Thomas Boch Olivier Bienaym ALADIN User s Manual 17 The size of such an image does not exceed 30 kBytes and thus the corresponding network load is very small You may load the original digitized FITS images of POSS surveys mostly to examine the faintest objects or faint and ex tented objects This is done after pushing the submit button Fig A and selecting the FITS format into the Info Frame win dow 7 The catalogue and survey server 7 1 VizieR The ability to access all VIZIER multi wavelength catalogues and tables directly from ALADIN is a unique feature which makes it an extremely powerful tool for any cross identification or classification work The request of a catalogue around a target relies on a spe cial feature the genie of the lamp this is the ability to de cide which catalogues among the database of currently about 4000 catalogues or tables contain data records for astronomi cal objects lying in the selected sky area In order to do that an index map of VIZIER catalogues is produced and kept up to date on the basis of about ten pixels per square degree for each such pixel the index gives the list of all catalogues and tables which have entries in the field When a user requests a catalogue around a target this in dex is queried and the list of useful catalog
4. 6 ttp cdsweb u strasbg fr cats cats ht 10 Daniel Egret Francois Bonnarel Pierre Fernique Thomas Boch Olivier Bienaym ALADIN User s Manual the Missions button triggers display of the available ob serving logs see B 4 5 Note that catalogues can be displayed in the View win dow without a background image making possibly easier di rect comparison of two catalogues or tables In this case the projection is even more precise as it is not adjusted to the pixel size 4 3 Shortcut commands for loading data As an alternative to using the Load button shortcut commands can be submitted by clicking in the Position window just below the menu Fig I5 ni Load Save YOPIot 2000 Simbaa MiziaR GC 2 2 M81 Fiet Fiel s 5 a i 4t p mali re u j d E ae ee ter it 2 kas r Fig 15 Inserting a shortcut command blue text on white back ground in the Position window The shortcut commands follow this syntax no space after the comma Get ServerName ServerName Target ServerName can be Simbad NED Aladin or VizieR For this last one the catalogue specification is required in parentheses For Aladin the survey colour or resolution can be specified as well between parentheses Target can be a Simbad identifier or J2000 coordinates in sexagesimal syntax If the Target is omitted Aladin takes into account the last specified t
5. CENTRE DE DONN ES ASTRONOMIQUES DE STRASBOURG ALADIN User s Manual Daniel Eegret Francois Bonnarel Pierre Fernique Thomas Bocht Olivier Bienaym g q y 1 CDS UMR 7550 Observatoire de Strasbourg 11 rue de l Universit 67000 Strasbourg France present address Observatoire de Paris Email question simbad u strasbg fr February 16 2004 Aladin Manual 2nd release describing Aladin version 2 Abstract ALADIN is an interactive sky atlas developed and maintained by the Centre de Donn es astronomiques de Strasbourg CDS for the identification of astronomical sources through visual analysis of reference sky images Contents I Introduction B e ALADIN interactive sky atla 12 the CDS 2 Alaq oplet Using Alac 5 etting started lll rns 5 e view panelg 3 4 e plane stack A 5 4 Vly Date 5 6 Properties l c 008 5 0 OF ob E bo de RUE R 5 6 4 D Dist uoce Re we Sa HS 5 0 ROB colour composition 5 0 6 DIOLS vu o o ooo oos 53 0 Colour map Histog 5 0 6 oom and image manipulation 5 6 9 cale and coordinate grid Ww W BW W QJ OO O00 00 N N N N N NNCAAAAAA AaAnNanAnaAaARA A 4 More Detailed Features 9 4 Vianipulating the plane stack 9 4 nteracting with the VizieR database 9 d ortcut commands for loading data 10 4 4 oordinates manipul
6. lt filter gt constraints block gt constraints block i constraint I lt action gt lt action separator gt Jj action separator Carriage Return constraint simple condition logical operator constraint undefined lt UCD gt lt column gt condition expression comparison operator value expression rese lt UCD gt lt column gt lt numeric gt x j lt expression gt w wn lt numeric gt function expression function abs cos deg2rad ln log rad2deg sin tan value string numeric lt unit gt logical operator amp amp comparison operator e Ww ql ww Well lt lt action gt draw lt color function gt lt shape function gt lt UCD gt lt column gt lt string gt hide lt UCD gt S UCD name lt column gt SI column name shape function circle fillcircle lt expression gt lt numeric gt lt numeric gt ellipse expression expression expression pm expression expression square xnomp eross ibus der nuecrodot color function rgb expression expression expression rainbow expression black blue cyan
7. A filter applies to all active catalogue planes located below it in the stack If the filter is in a folder it applies to all active catalogues located below it within the same folder including catalogues being in subfolders OE Api xi ge Load Save VOPlot Print Hep Quit Field 06 32 18 03 04 52 00 1 12 91 x12 91 ngc2244 4l 2 SEDI La m 3 ze Simbad o TEST o Fold CIRCLE GSC12 USNO2 o POSSILF DSS2 Zoom 2X gt ud zh re 58 21 3 IA lo 2 ID DINED 3 x 4 Fig 19 Scope of filters see text Figure explains this principle Two filters TEST and CIRCLE have been created TEST just prints the text string TEST and CIRCLE draws a circle according to the magnitude of the object As you can see the filter TEST applies to planes GSC1 2 and USNO2 which are below it but does not apply to plane Simbad CIRCLE applies to GSC1 2 which is in the same Daniel Egret Francois Bonnarel Pierre Fernique Thomas Boch Olivier Bienaym ALADIN User s Manual 15 folder but does not apply to USNO2 even though it is located below CIRCLE Whenever a filter or a catalogue plane has moved when ever a new catalogue plane is created filters results are auto matically reprocessed and updated 5 3 6 Applying multiple filters You can apply several filters simultaneously Each filter has its own scope and each filter
8. en Aladin Aladi ae Jump to francais eus applet dadin Aladin Boe uon uen 5 previewer New Previewer in RGB mode January 2004 Colored composition by the previewer New ALADIN RELEASE 2 0 November 2005 Metadata list tree VOPlot plug in IDHA SIA compatibility UCD help filter popup menu Autoscan user directory Autocut ehancement mare info Description Aladin is an interactive software sky atlas allowing the user to visualize digitized images of any part of the sky to superimpose entries from astronomical catalogs or personal user data files and to interactively access related data and information from the SIMBAD NED VizieR or other archives for all known objects in the field Aladin is particularly useful for multi spectral cross identifications of astronomical sources observation preparation and quality control of new data sets by comparison with standard catalogues covering the same region of sky The Aladin interactive atias is available in three modes a simple previewer a Java applet interface and a Java Standalone interface The CDS provides the images of the Two Micron All Sky Survey MASS from the University of Massachusetts and IPAC JPL Caltech the images of the Space Telescopes Science Institute Digital Sky Survey D353 I D353 ID with complete sky coverage as well as an ensemble of higher resolution images ESO R and SERC plates digitized at the MAMA facility in Paris These lat
9. 2 12 91 x12 91 M33 a ZA Contours USNOB1 OQ DI POSSII J DSS2 Zoom 213K ni ge al i T so 2 e zat Ex mss co m t 3 S P mi Ao erar Dito e UA Bl Qu LES ae Eus E GN M Isocontour at level 153 0 WEE Fig 11 Contour plot of M 33 3 6 7 Colour map Histog You can modify the colour map of the image by clicking on the Histog button Fig 2 iix Color map fi for ngc240 the color map according to the image color histogram Move the three triangles to adjust Help A A 47 228 Reverse BBIAIGray Prev Reset Original pixel range 1 251 Autocut limits 47 228 Use Aladin autocut algorithm Replay autocut Close Fig 12 Colour map panel This window pops up when you push the Histog button It displays the histogram of pixel val ues of the current background image You can reverse colours Reverse button apply false colours BB A Gray similar to the corresponding features of DS9 saoimage and adjust the pixels dynamics move the left triangle towards the right to suppress the background noise move the right triangle towards the left to enhance the objects adjust the middle triangle according to the histogram to en hance the intermediate gray levels 3 6 8 Zoom and image manipulation The square window at the bottom right corner is the Zoom win dow it displays a quick view of the current active image on the
10. 5 S DimMi DimPA 14 Daniel Egret Francois Bonnarel Pierre Fernique Thomas Boch Olivier Bienaym ALADIN User s Manual Ellipses for GSC2 draw ellipse S EXTENSION RAD S EXTENSION RAD 1 STPHYS ECCOENTRICITY 2 0 3 S POS POS ANG the pm function was designed to allow the visualization of proper motion of stars It takes 2 parameters which are the proper motion in right ascension and the proper mo tion in declination and draws an array corresponding to this proper motion If units are missing or could not be un derstood both parameters are assumed to be in mas yr By default a proper motion of Imas yr is displayed by an array of larcsec E g Draws proper motions Imas yr will correspond to an array of 5 arcsec draw pm 5 S POS_EQ PMRA 5 9 POS EQ PMDEC 5 3 Usage in Aladin 5 3 1 Creating a filter lol xi ie Load Save VOPIot Print Help Quit era J2000 plane stack free E lo whe p BIS Es E Properties Properties of the filter Filter0 Label Filter Choose a predefined filter Predefined filters text tag 1 ii BOTI Or enter your own filter definition 0 Lu E i J mm a Sa PHOT 16 Close gb c z 1 draw circle PHOT Fr Help on syntax 2 zoom b z Get Manual Z A mglss P X del Save filter Load filter Save fiter Load
11. Aladin Label Button or menu label Aladin Menu label or upper level button in case of a submenu Aladin LabelPlane Template of the plane label Sn is to be re placed by the corresponding parameters DistribDomain keep this line as is Owner keep this line as is Url Server url template with n variables specifying the fields which have to be filled up by the users Param Description n Description of the field number n Param DataType n Data type of the cor responding parameter The available types are Target COO RA DE SIMBAD NED and Field RA DE SQR RADIUS Param Value n Default value or list of possible values for the corresponding parameter ResultDataType Mime xxx To specify the data type pro vided by the server For images image fits fits file image gfits gzipped image hfits h compressed and for data text plain text tsv or text csv tab separated value syntax and text xml for data in XML strores syntax see section 8 2 3 The servers that you have defined will be accessible by the buttons at the left side images or right side data of the server selector window in your local Aladin standalone version 8 5 Script language In order to use Aladin Java in script mode Aladin can be con trolled via in line commands These commands have to be sub mitted to the Aladin gt prompt which appears just after start ing the application only w
12. AladinJava script gett Aladin Simbad VizieR GSC2 2 M50 Opening this URL from a browser triggers the display of a DSS I view of the open cluster M50 with SIMBAD and GSC2 2 overlays The detailed syntax of the input string following the ques tion mark is the same as the syntax of the script language see section 8 5 Daniel Egret Francois Bonnarel Pierre Fernique Thomas Boch Olivier Bienaym ALADIN User s Manual 11 An automatic generator of scripts and of URL helps you building more easily simple scripts and URL see aladin pl frame form http aladin u strasbg fr java nph 5 Filters in Aladin 5 1 Introduction Filters are an elaborated feature in Aladin allowing one to cus tomize the display of catalogue planes in Aladin Without filters all entries from a catalogue plane are dis played with the same symbol and the same colour the only parameters used from the original catalogue are the sky coor dinates RA and Dec of each entry Thanks to the filters feature it is possible to use the other parameters from the original catalogue e g magnitudes ob ject types velocities in order to perform selections and mod ify the symbol shape color size or text according to a parame ter or a combination of parameters using arithmetic operators x The position of the symbols is always the sky posi tion in the current field Figure 16 is an illustration of the possible use of a filter br
13. DS551 444 PLATE 26 7 pi omes SERC I optical I 12 8 x12 8 DS32 445 1 0 pix SERC I optical I 6 4 x6 4 DS 32 445 PLATE 24 0 pi Others C AAO R optical R 12 8 xl2 6 DS332 444 1 0 pix Own data 7 AA0 R optical R 6 4 x6 4 D332 444 PLATE 24 0 pi 9 ESO R optical R ll 4 xll 4 MAMA 444 0 667 p yj Eso R optical R 6 3 x6 3 MAMA 444 PLATE 21 4 pi FoV SUBMIT Metadata Reset Clear Close MyData H Fig 4 Example of Images Data ALADIN Load panel Images are extracted e g from Digitized Sky Surveys DSS covering the whole sky in several colours section The size of a sky field is determined by the resolution of the image For full resolution images it is 14 1 in the case of DSS I and 12 9 for DSS II The image server also currently pro vides DSS images in low resolution about 1 5 x 1 5 and global views of the original photographic Schmidt plates about Daniel Egret Francois Bonnarel Pierre Fernique Thomas Boch Olivier Bienaym ALADIN User s Manual 5 6 x 6 Other image surveys such as the 2 Micron All Sky Survey 2MASS are also included in the image database To abort a query click on the plane name associated to your query Remove this plane by clicking the Del button in the tool bar 3 3 The view panels The ALADIN interface comprises the following windows and panels Fig DJ View window the main window used for display
14. OPIot Print Help 2000 12 02 02 50 18 53 32 2 Field 12 01 52 54 2 B a SETTE Q s Bn af s D o BBA Usno 9 yor o csc22 o Simbad o sont MERE aA O RDSS2 97 zoom 1x PINE 3 u EX Y gt BESEBSEEETERE 150 510425 18 992281 20 6 18 2 1985 098 0675 11851476 180 514123 18 905131 18 5 17 6 1985 098 0675 11851484 180 514406 18 905217 18 3 17 7 1954 252 120 3 http Avizier u strasb g fre gi bin VizieR 57 info AML e out add a source I252 out USNO A2 0 0675 11861319 Fig 22 A view of the Aladin Standalone version featuring the Antennae galaxies Objects present in Tycho 2 GSC and USNO A2 0 are flagged with different symbols and a contour of the field of view of the HST WFPC2 camera has been dis played using the FoV function Field size is 14 arcmin The Save and Print buttons in the top menu are typical of the Standalone version It is possible to Save the work session in a proprietary Aladin Java AJ format for future re use or to Print a postscript version of the main View Fig 23 8 1 Starting the Stand alone version ALADIN Standalone version requires a Java Virtual Machine To be sure that you have a sufficiently recent one download the Aladin Java package that includes a Java VM 8 1 1 The Java Virtual Machine The Java binary code generated by a Java compiler is inde pendent from an
15. Thomas Boch Olivier Bienaym ALADIN User s Manual 13 5 2 5 Constraints The logical operators used to combine conditions are amp amp logical AND and logical OR Example gt PHOT PHG BISIO 66 gt PHOT PEG RI lt 5 STCLASS OBJECT Star draw A constraint can also be empty In such a case the corre sponding actions apply to all sources Example No constraint the action block F is applied to all sources draw blue 5 2 6 Actions Actions change the appearance of symbols in the related cata logue plane Available actions are hide does not display the entry This action is useful to hide a part of the plane sources draw when used without parameters this action draws the source as usual using the default shape and color of the plane The action has two optional parameters for cus tomizing both shape and color of the symbols Example draw green square You can also draw a text string which may be either a con stant string or the content of a column The color can also be specified Example draw CLASS OBJECT blue 5 2 7 Defining a color You can specify the color you want to assign to either a symbol or a text string The color function is optional and can be placed either after the draw keyword or after the optional shape func tion Example Color function after the draw blue square 1T Color tunctron alter the shape function draw circle S PHO
16. darkGray gray green lightGray magenta orange pink red white yellow
17. drawn below Image servers Data servers VizieR catalog service Specify a target and a catalog name or identification Aladin Target m33 Brab coord Surveys in VizieR Catalog g 56A Radius f D arcmin s don t know which catalog Select the SkyView potentially interesting ones with words keywords Author free text Simbad Wavelength Mission Astronomy Others mM Binaries cataclysm Binaries eclipsing Binaries spectrosc Blue objects x Cluctarc ni ug FoV A SUBMIT Metadata Reset Clear Close 2 IRAS Serendipitous Survey Catalog IPAC 2 IRAS Faint Source Catalog Ib gt 10 2 MSX6C Infrared Point Source Catalog Ege 2 Extragalactic IRAS sources Condon 1995 2 MSX galaxy observations Kraemer 2002 1 IRAS Small Scale Structure Catalog Ver l Infrared Photometry and Zlcm data for ne l IRAS Observations of Large Optical Gala l The Extended lZum galaxy sample Rush 1 Own data MyData i J AT 109 2318 Radio J AJ 124 2990 IR NII 73 IR NII 75 IR VII 109 IR NII 157 IR VII 185 IR J pJ 554 803 4 Get info l IRAS 1 2 Jy IRAS Redshift Survey Straus Radio l New VLA Sky Survey NV55 Cat of IRAS 2 Y b Fig 14 VizieR query panel and a list of catalogues in the neighbourhood of the target list provided by keywords The interface between ALADIN Java and VizieR presents different alternatives for the choice of catalogues Once you have pushed the L
18. edu PET ues Load l Save VOPIOot Print Help Quit ENO c 4 9 2 o EB GSC2 2 o Simbad o sts gt U2LX0501B SERC S MAMQ Zoom 1 2x i En paciiete ep CIl NGC 6611 BKP 29703 Click on it or enclose it to see the measurements 0761 0469540 274 719470 13 828500 2000 0 2 o o 9 70 9 32 5 57 9 30 9 19 of c 5689 439 1 1 6 1 4 9 733 9 465 89743 274 71947667 13 82850389 19 6 14 7 14 1 33001303847 274 719472 13 828498 9 73 0 T T c ULP CNRS 1999 2003 Centre de Donn es astronomiques de Strasbourg Fig 8 Example of ALADIN display of a famous image from the HST archive WFPC2 featuring the Eagle Nebula Objects present in Simbad GSC and USNO B1 0 are flagged with dif ferent symbols Field size is 2 6 arcmin full image right and 1 6 arcmin left 3 4 6 Instrument Field of View It is possible to overlay the field of view FOV of some ma jor instruments presently CFHT cameras XMM Newton and ISO instruments HST WFPC2 camera Rotation of the field when applicable can be monitored through the Prop tool 3 4 7 My Data Local user data files can also be overlaid just specify an URL and push the submit button The stand alone version allows to load files directly from directories see Section s 27 below 3 5 Learning more about
19. including http vizier u strasbg fr 6 Daniel Egret Francois Bonnarel Pierre Fernique Thomas Boch Olivier Bienaym ALADIN User s Manual the major reference catalogues and surveys the user can alter natively select the catalogues for which entries may be avail able in the corresponding sky field using the VIZIER query mechanism by position catalogue name or keyword see be low J for more details 3 4 4 NED Information from the NED database objects referenced in the NASA IPAC Extragalactic Database can also be visualized through queries submitted to the NED server at IPAC 3 4 5 Mission logs and Image Archives Archive images through mission logs Hubble Space Telescope HST Chandra VLA NRAO and FIRST images are currently available among others The user should first query the corre sponding observation log before retrieving the archived images from the Image Association CADC and similar buttons in the Measurement field Fig 6 and E 15 xl Data servers e Server selector Choose an image server or a data server Image servers and fill in the associated form drawn below VizieR Catalogs Missions in VizieR Aladin i Specify a target and a mission to get the point sources Select them in the view window to getthe associated images Target me Srab coord Mission HST Radius arcmin For your help you can pick up mission names from the list below CFHT Log of CFHT Expo
20. input as below java Jar Aladin ar Ssecripr TOO Aladin produces transparently an image file called m99 bmp with a DSS2 image and the USNO2 catalogue overlay Launching Aladin with predefined images or data The script commands can also be used in the URL see sec tion 4 6 to directly launch a predefined set of images and data For example the following URL will launch Aladin for a field around NGC 1097 with a DSS2 image SIMBAD NED and USNO2 data on reverse mode and a coordinate grid Collaboration with STScI and especially with the late Barry Lasker and with Brian McLean is gratefully ac knowledged We thank Jean Guibert and Ren Chesnel from CAI MAMA for their continuous support to the project We thank Roc Cutri IPAC for his kind help in setting up the ac cess to 2MASS images and data Implementation of external links has been made possible by the collaboration of the ser vice producers The Digitized Sky Survey was produced at the Space Telescope Science Institute under U S Government grant NAG W 2166 The images of these surveys are based on photographic data obtained us ing the Oschin Schmidt Telescope on Palomar Mountain and the UK Schmidt Telescope Java is a registered trademark of Sun Microsystems References Bonnarel F Fernique P Bienaym O et al 2000 A amp AS 143 33 Aladin Genova F Egret D Bienaym O et al 2000 A amp AS 143 1 CDS Greisen E W Calabretta M 1
21. performs its actions apart from each other 5 3 7 Creating a filter in script mode Filters can be used in script mode via in line commands The syntax is almost identical The only difference is that the com mand starts with filter filtername and ends with a closing bracket The filter definition can be on multiple lines the prompt shows Aladin Filter def until the final is entered Example Aladin gt filter circle Aladin Filter def gt draw circle PHOT Aladin Filter def 5 3 8 Miscellaneous tl Alad in v2 0 nl x ATE Load Save vopiot Print Help Quit 2000 l Field 01 33 51 20 30 39 34 RNE 8 14 17 x14 17 m33 p ray ERD d p EE 4 SINS 4 f Properties Properties of the filter Filtero Label Filter Choose a predefined filter Predefined filters o Or enter your own filter definition OOD SER Selected sous ER Filte 100 O USNO B1 Q PA possLEDSSQ Zoom 1x con PHOT PHG B PHOT PHG R gt lug4 draw 3 Help on syntax Get Manual Save filter Load filter Coil ate a new plane with all filtered sources Fig 20 Export feature Figure P0 shows buttons contained in the Properties win dow of a filter Export creates a new catalogue plane containing all filtered sources This can be useful to save the result o
22. plane stack The green rectangle specifies the size of the current view seen in the large View window according to the zoom scale and the total size of the ALADIN window By dragging this rectangle you can change the displayed area The zoom scale can be changed i with the little menu button or 11 through the contextual popup menu right button clicking in the View window or 111 directly clicking in the View window if the Zoom button is activated The size of the View window depends on the total size of the Aladin Window With the Applet version click on the Detach button to separate Aladin from the browser and by do ing so you will be able to maximize the window size To get a survey image adjacent to the current one it is pos sible to use the ZOOM tool with a factor less than 1 After that use the Grab coord button of the image server form and select the center of the next image by clicking in the view margin 3 6 9 Scale and coordinate grid By invoking the contextual menu popup menu clicking the right button of the mouse or CTRL click in the MacOS en vironment in the view frame you can display the scale and coordinate grid 1 the scale a small line gives the scale of the view 2 the coordinate grid for constant RA and DEC values 3 the target a large cross indicates the object or position used as center in the initial query 3 6 10 Cut and paste using the Pad window Open the Pad window wit
23. plus Draw a rhomb for Radio objects S TCLASS OBJECT Radio draw rhomb Draw a dot for other objects draw dot In addition there are some shape functions requiring pa rameters the circle function is used to draw a circle whose radius de pends on a parameter which can be any column or combina tion of columns The typical use of this function is drawing circles according to magnitude values There are 2 optional parameters to define the minimum and the maximum ra dius size in pixels otherwise these values are set by de fault Parameter values are normalized to fit into the range Example Draw circles according to Johnson B mag draw circle S PHOT JHN B Draw circles according to Johnson B mag Set min value to 3 max value to 40 draw circle PHOT_JHN_B 3 40 the fillcircle function is similar to the circle one It draws a filled circle instead of an empty one the ellipse function is typically used to draw dimension el lipses or error ellipses It takes 3 parameters the semi major axis the semi minor axis If the unit of one parameter is missing or not understood semi major and semi minor axis are assumed to be in arcsec and the position angle is assumed to be in degrees If the position angle can t be re trieved or is empty its value is assumed to be zero Example Drawing dimension ellipses for Simbad and GSC2 sources Ellipses for Simbad draw ellipse 0 5 S DimMa 0
24. stand alone version allows you to load personal images or tables stored on your local computer hard disk 8 2 1 Local images Images should be in FITS format with WCS fields in the header see e g Greisen amp Calabretta 1995 Note that you have to increase your JVM memory if you need to load large files To do that you can play with two pa rameters of the java command ms number set the initial Java heap size mx number setthe maximum Java heap size For example a command like java ms800m mx800m jar Aladin jar might allow you to manipulate the large CFH12K images 400MB l1 http www cv nrao edu fits documents wcs wcs htm 8 2 2 Calibrating Images Images without astrometric calibration can be loaded In order to visualize and overlay catalogues on them you will need to build an astrometric calibration To calibrate or to redo the calibration of any images as trometric calibration tools are available in Aladin The astro metric reduction menu is activated from the properties menu associated to your image plane You will also need astromet ric references from another calibrated images of the same area or from a corresponding astrometric catalogue Just clicking a few common stars to your uncalibrated image and to your ref erence frame image or catalogue can be sufficient to obtain a rough astrometric calibration examples for image calibrations are given at the address http aladin u strasbg fr tutorials
25. the astronomical objects 3 5 1 Selecting objects For information planes related to data bases SIMBAD VIZIER NED links are provided to the original data This is done in the following way when selecting an object on the image with mouse and cursor summary information is displayed in the Measurement panel on the bottom of the ALADIN window section B 5 2 the data line includes links to the original data that can be activated The retrieved information will appear in a separate window on the Internet browser It is also possible to select with the mouse and cursor all ob jects in a rectangular area the corresponding objects are listed in the Measurement window the colour of the triangle at the left of each line recalls the data plane to which it refers Daniel Egret Francois Bonnarel Pierre Fernique Thomas Boch Olivier Bienaym ALADIN User s Manual 7 To select all the objects of a data plane use the contextual popup menu related to the plane stack At any moment the position of the cursor is translated in terms of right ascension and declination on the sky and visual ized in the Position window see also f 4 3 5 2 The Measurement window When objects are selected as explained above the data for these objects corresponding to the active data planes are listed in the Measurement window on the bottom of the ALADIN win dow This list includes basic information name position and when applicable number of bibliogra
26. the view to stop the polyline The drawing is memorized together with astronomical po sitions It means that you can display it on another image not necessarily having the same resolution You can move a contour with the Select tool by clicking and dragging one of its control points First select the contour and then click and drag one of the control points little squares on the contour aio x 215 x Properties of the plane GSC2 2 Properties of the plane SERC S MAMA 662 Laber osc2 2 Labet SERC S MAMA 662 Pee B E m Plane state C hidden visible m Field 18 18 48 00 13 47 00 3 11 46 11 46 Shape momb E SERC ORIGIN 8 Shortr Plane state C hidden visible Format Jpeg format Epoch 1980 662 WCS equinox 2000 0 Size 1024x1024 pixels Origin Field 18 18 47 87 13 47 00 0 radius 16 0 Sources 1501 Origin Provided by CDS VizieR catalog service Provided by CDS Aladin image server Projection on plane jimage SERC S MAMA 662 Y Aladin reduction New Edit method Apply Close Astrometrical reduction Aladin reduction New jit method Flipflop methods Top Bottom RightLett Apply Close Fig 9 Examples of Properties windows for a catalogue plane left and for an image plane right The colour and shape of the symbols from a data plane displayed in the View win dow can be modified by using the corresponding menus left Epoch and so
27. 995 in Astronomical Data Analysis Software and Systems IV ASP Conf Ser 77 p 233 FITS WCS Guibert J 1992 in Digitized Optical Sky Surveys H T MacGillivray amp E B Thomson Eds Kluwer Academic Publ p 103 MAMA Ochsenbein F Bauer P Genova F 2000 143 23 VizieR Wenger M Ochsenbein F Egret D et al 2000 A amp AS 143 9 Simbad http aladin u strasbg fr AladinJava script get Aladin DSS2 Simbad NED VizieR usno2 NGC1097 gridton sync reverse Local images can be called by using the following script command get MyData YourURL 9 User feedback The users play an important role by giving feedback on the desired features and user friendliness of the interfaces by mail to question simbad u strasbg fr New developments are currently considered as additional modules which will be incorporated to the general release only when needed possibly as optional downloads in order to keep the default version simple and efficient 10 Acknowledgements CDS acknowledges the support of INSU CNRS the Centre National d Etudes Spatiales CNES and Universit Louis Pasteur Daniel Egret Francois Bonnarel Pierre Fernique Thomas Boch Olivier Bienaym ALADIN User s Manual 21 Appendices Appendix A Backus Naur Form of filter syntax This is an attempt to describe the syntax of a filter in the extended Backus Naur Form It describes in a shorter way what has been explained in section 6 2
28. Bonnarel Pierre Fernique Thomas Boch Olivier Bienaym ALADIN User s Manual Access to personal files is not possible from the applet due to security restrictions of the Java language However per sonnal files accessible through a URL section B 4 7 remains available with the Java applet version These restrictions do not apply to the stand alone version see below J Aladin 2 0 ain E T ni x Load Save VOPIot Print Help Quit 2000 w 0 36 46 91 27 27 56 0 Field 10 36 51 32 27 31 35 5 14 17 x14 17 10 37 00 li ZA ACO 1060 elec ro m F3 dist 7 filter P x EM BER no o 7 MA csc2 o a amp ZA ma o isis cont PAED pss4 J SERGO 7 zoom 1x 3 a HEX 4 Gici 10 36 46 43 27 28 38 4 sooj 300 s92 IX 110 36 7 27 29 225000 225000 10 glcl 10 36 45 0s 27 28 28 6 sooj 300 92 86 G1C1 10 36 44 58 27 28 28 9 gt SGM95 69 Fig 3 Example of ALADIN window with an image centered on the Hydar I cluster of galaxies ACO 1060 and objects from SIMBAD GSC2 2 and NED marked by symbols Aladin Java is compatible from Java release 1 1 2 If your web browser Explorer Netscape Mozilla supports java you support Aladin Java Applet On some recent browsers you have to install a java plugin machine then follow your browser documentati
29. NO Are there remaining sources YES Consider next source Go to the begin of the filter Are there remaining blocks YES Consider next block NO Do the current source verifies constraints of the current block Perform all corresponding actions END Fig 17 How a filter processes a set of sources The syntax is the following Parameters always begin with dollar sign UCDs are enclosed in square brackets E g S POS EQ PMDEC Or S PHOT FEUX RATIO are valid UCD names Column names are enclosed in braces LumRat or Imag are valid column names UCD names are case insensitive in fact they are automat ically converted to uppercase whereas column names are case sensitive The star and the question mark can be used as a wild cards in UCDs or column names For instance PHOT will point out the first column name being tagged by a UCD begin ning with PHOT 5 2 2 Comments Comments may be inserted into filters Each line beginning with will be ignored Example t This qs aceommnent 5 2 3 Arithmetic expressions using UCDs columns The following operators are used to combine catalogue param eters The parameters are specified via the corre sponding UCDs or column names They can be used to define constraints but also in some action parameters Example B
30. T PHG B 00ff00 draw keyword There are different ways to define a color rrggbb where rr gg bb are respectively the values of red green and blue components of the color in hexadecimal Example draw 44dd99 predefined color names allowed values are black blue cyan darkGray gray green lightGray magenta orange pink red white yellow Example draw red rgb function allows to define a color whose components depend on some column values For each component the max and the min values are computed so that each value is normalized in order to be in the range 0 255 Example draw rgb PHOT_PHG_B 0 S PHOT_PHG_B rainbow function has a single parameter in the range 0 1 This filter aims at going through the whole visible spec trum red to violet O to 1 If the parameter is variable for instance a column name the values are normalized be tween 0 and 1 This can be used to visualize a color index Example draw rainbow S PHOT JHN U B 5 2 8 Symbol shape Symbol shape can be customized through the call of an op tional parameter placed either just after the draw keyword or after the color function There are shapes without parameter they are the same as those in the properties of a catalogue plane square rhomb cross plus dot microdot Example Filter drawing different shapes according to the object class Draw a plus for Star objects S CLASS_OBJECT Star draw
31. arget If for an initial query there is only a Target and no ServerName Aladin will load a default set currently DSS I high resolution image SIMBAD and GSC1 2 You will find in the FAQ of the interactive HELP menu detailled possibilities for the syntax of shortcut commands Examples get Simbad VizieR GSC1 2 M 81 get Simbad 00 42 44 10 41 16 08 8 get Aladin DSS2 VizieR USNO2 NGC 7436 get Aladin DSS2 NED 18 19 13 50 get Skyview Rosat M 1 get SSS UKST M 2 4 4 Coordinates manipulation It is possible to visualize the location of a specific object or po sition in the current view by simply clicking in the Position window and typing the coordinates or Simbad identifier After pressing the RETURN key the current target large will move at the corresponding position in the View window Also if you click on the View vindow the corresponding posi tion will be automatically memorized in the Position window and in the note Pad window Move the cursor in the Position window or in the note Pad window to retrieve this position and possibly cut and paste into another application When you move the cursor on the object data line in the measurement window the position of this object is automati cally given in the current coordinate reference system in the position window You can easily display coordinates in another reference system using the nearby menu button if you select e g the Gal reference system an
32. ation 10 voae 10 L6 URLcommandlned 10 5 Filters in Aladin 11 BI Introductio seen 11 DZ YD X ewe oo v 90 koe Xov R4 11 ok Sa ee UM P M 11 522 Commenid 12 D Arithmetic expressions using Po UCDscolmnd 12 B24 Condiiosg 12 B25 Contnits 13 EZG Ac ond 13 1 9 5 mE POE UE M 13 5 2 0 E D EG oss Ru B oe S 4 13 5 Usag Aladi s uw eo SURE XR WS E 14 5 3 reatingafiltey s 14 5 Vlod gafilley 14 ee eee 14 5 34 Activate Deactivate afiltel 14 D copeofafitte 14 5 3 6 App o ole filters a 15 5 3 reating a filter in script mode 15 B38 Miscelaneound 15 15 6 Database summary 15 6 D E sw E 4o Rom Eos cS x uo 15 6 VIAMA CA Sed cles 16 6 4 MASS near infrared survey 16 Deedee eee teeta ee 16 6 6 Image astrometry 16 6 magecompression 16 N Daniel Egret Fran ois Bonnarel Pierre Fernique Thomas Boch Olivier Bienaym ALADIN User s Manual e catalogue and survey serve A O 2 ocal images O Z alibrating Image e D o Acknowledgements Dackus Naur Form o ter svntax 17 17 17 17 17 17 17 18 18 18 18 18 19 19 20 20 21 Daniel Egret Francois Bonnarel Pierre Fernique Thomas Boch Olivier Bienaym ALADIN User s Manual 3 1 Introduc
33. d move the cursor on the ob ject data line you will see the position displayed in Galactic coordinates 4 5 Using the SHIFT key for hidden features In order to keep the Aladin interface as simple as possible some features are hidden and require the usage of the SHIFT key By this way you can Remove several planes at a time specify several planes by clicking on their name with the SHIFT key down After that press the Del button Remove all planes with the SHIFT key down press the Del button Select several individual sources maintain the SHIFT key down and click on each source Select all sources of a plane specify the plane by click ing on its name and with the SHIFT key down press the Select button possibly twice if there was previously some selected objects Open links in new browser windows click on the links with the SHIFT key down Force a catalogue projection in the plane stack click on the left of the plane logo of a catalogue with the SHIFT key down where there should have a little black triangle if it was an image plane Center the view click in the Zoom Frame at the bottom right of the screen with the SHIFT key down to re center the current view only if the current image is larger than the view window 4 6 URL command lines It is possible to use a URL Uniform Resource Locator for sending input to the Aladin server Here is an example http aladin u strasbg fr
34. dition Affichage Favoris Outils 7 ae Adresse ra http faladin u strasbg fr AladinPreview vj ba OK Aladin previewer RGB composition Central coordinates of the field J2000 R 13 29 52 370 Dec 47 11 40 30 Red POSSUVE DDSSI Green POSSILF DSS2 Blue POSSII DSS2 Available image s 2NLASS H Fits 2MASS I Fits 2MASS K Fits POSSI E DSS1 Jpeg POSSIL F DSS2 Jpeg POSSII DS3532 Jpeg POSSII N DS32 Jpeg Rejload image New query Fig 2 Result page of ALADIN previewer for the galaxy M51 The default image is from DSS I The result page Fig P gives also access to the other sur vey images available and to the full resolution FITS image for download This is a direct and simple tool for sky visualization with out the interactive features catalogue access overlays of the main Java version 2 2 Aladin applet The Aladin Java applet is the primary public interface support ing queries to the CDS image server overlays from any cata logue or table available at CDS or from SIMBAD and NED databases and access to a number of remote archives ALADIN applet is available directly through current Web browsers such as Netscape Mozilla or IExplorer It allows the user to query images catalogues data to ma nipulate the images by zooming or modifying the dynamics to access the full records of any sources to add or draw symbols vectors etc 4 Daniel Egret Fran ois
35. e view with the current overlays can be saved in bmp format An HTML page with links to the original images loaded in the plane stack can also be created Daniel Egret Francois Bonnarel Pierre Fernique Thomas Boch Olivier Bienaym ALADIN User s Manual 19 8 4 Defining additional servers The user of the Standalone version can define and query new data or image servers besides Simbad Aladin or VizieR To do that you have to append the new server definitions in the configuration file AlaGlu dic present in the Standalone package and restart Aladin The servers have to be accessible by a simple URL with a HTTP GET method The syntax required for these server def initions follows the GLU recommendations Adapt this short example to your own needs ActionName Foo Description My own server definition Aladin Label MyServer Aladin Menu Others SAladin LabelPlane MyServer 1 52 DistribDomain ALADIN SOwner CUS Aladin SUr1 http xxx yyy ra Sl amp dec 2 amp radius 3 amp color 4 SParam Description 1 Right Ascension Param Description 2 Declination Param Description 3 Radius Param Description 4 Color SParam DataType Sl Target RA SParam DataType 2 Target DEC SParam DataType S3 Field Radius SParam Value 3 14 1 arcmin SParam Value S4 Red SParam Value S4 Blue SParam Value S4 Infrared SResultDataType Mime image fits ActionName Unique identifier Description Server description
36. eci fied filter md name create a new folder mv nni namel nn2 name2 mm99 name99 move planes nn name below plane mm99 name99 or into if mm99 name99 is a folder rm nn name remove a plane the selected plane or the plane nn name or a folder and its content select nn name select the plane nn name number 1 is the bottom plane hide nn name hide a plane the current selected plane or the plane number nn or the plane named name show nn name show a plane the selected plane or the plane number nn name number nn ref nn name set the plane nn name as the reference plane reset reset the Aladin plane stack grid on off un activate the coordinate grid reticle on off un activate the reticle 20 Daniel Egret Francois Bonnarel Pierre Fernique Thomas Boch Olivier Bienaym ALADIN User s Manual info msg print a message in the status window scale on off un activate the scale line status display stack plane status help display this help pause nn wait nn seconds default one sync wait until all planes are ready timeout nn off set nn minutes as timeout default 15 mem display the current memory size quit stop Aladin ocript example Suppose that the file foo contains the following lines grid get aladin dss2 vizier usno2 sync Zoom 2x cm BB save m99 bmp quit m99 By redirecting the Aladin standard
37. f a filtering process The names of all the avalaible loaded columns during a Aladin session can be displayed by activitating a pop up menu right button mouse in the command menu of the filter proper ties window This allows to select and load a column name in the filter command window 6 The image database 6 1 Database summary The ALADIN image collection consists of The whole sky image database from the first Digitized Sky Survey DSS I digitized from photographic plates and dis tributed by the Space Telescope Science Institute STScI as a set of slightly compressed FITS images with a resolu tion of 1 8 arcsec DSS II full sky R and band and Palomar 6 band sur veys scanned at STScI with a pixel size of 1 arcsec Images of crowded fields Galactic Plane Magellanic Clouds at the full resolution of 0 67 scanned at the Centre d Analyse des Images MAMA machine Observatoire de Paris the ESO R survey also digitized with the MAMA will be soon included in the data base Global plate views 5 deg x5 deg or 6 deg x6 deg accord ing to the survey are also available for all the plates con tributing to the image atlas these are built at CDS by aver aging blocks of pixels from the original scans Low resolution images Aladin image server also provides DSS I images in low resolution generally 1 5 x 1 5 de grees The 2MASS J H and Kg images The sky survey have been released by the 2MASS P
38. fiter E Export Create a new plane wi filtered sources 2 Fig 18 Creating a filter in 3 steps Figure I8 describes how to create a filter First click on the Filter button in the tool bar This will create in the stack a new plane dedicated to a filter The Properties window will pop up in order to let you enter your definition Type in your filter definition or choose a predifined filter and press the Apply button In the properties window of a filter predefined filters are intended to help you understand the syntax of a filter 5 3 2 Modifying a filter To modify a filter open the Properties window of the filter Then modify the definition and press Apply to confirm the changes If the filter is active the result will be updated If it is not the new definition will be taken into account as soon as the filter becomes activated 5 3 3 Syntax errors When creating or modifying a filter one may enter a defini tion which is syntactically incorrect If it happened the filter is deactivated and a message pops up announcing the detected error At the same time the status disc next to the filter name in the stack turns to red If you try to activate a filter whose definition is incorrect you will see a message asking you to correct the error 5 3 4 Activate Deactivate a filter Filters are like other planes you can easily activate or deacti vate them just by clicking on the logo 5 3 5 Scope of a filter
39. h the Pad button This window stores information associated to the graphical planes tags dis tances and also data about astronomical objects selected with the mouse It is available for cut and paste For example from the Pad it is easy to export some data from Aladin to MS Excel 3 7 Help Opening the interactive HELP mode menu move the mouse pointer on one of the interface components a short help related to this component will be displayed Click elsewhere to quit the help mode Daniel Egret Francois Bonnarel Pierre Fernique Thomas Boch Olivier Bienaym ALADIN User s Manual 4 More Detailed Features 4 1 Manipulating the plane stack The plane stack allows you to control the current projection Each plane keeps the result of a server query image servers or data servers or possibly some additional graphical objects such as tags or drawings Click on a plane icon to ask to activate it according to the current projection the icon is dark when the plane is active Click on the eye icon to switch on off projection of all possible overlay planes m a I m1 2 JJ BBEDEBD zt E m S HIP NED GSC2 2 Simbad Pleiades Zoom 1x Fig 13 A plane stack in a field featuring the Pleiades Simbad GSC2 2 USNO B1 and 2MASS are the active data planes NED has no entry in this stellar field as can be seen from the status icon on the right 2MASS is the selected plane framed name ready fo
40. ight sources have been circled ans labelled while magnified proper motions are plotted This example can be built using and modifying predifined filters MAGNITUDE CUT PROPER MOTIONS Fig 16 Example of magnitude circle and proper motions filter result A list of predifined filters is proposed to cover some fre quent situations and a pop up menu helps you to build filter commands For instance the predefined MAGNITUDE CUT filter allows to draw the objects of a table having a magnitude smaller than 16 The magnitudes come from the first column for which the object has a photometric magnitude given by a UCD of the S PHOT form For this example the filter command appearing in the filter window has the form PHOT 16 draw and can be easily modified The UCD generic name PHOT may be replaced by any columns of loaded tables The names of all the avalaible loaded columns during a Aladin session can be displayed by activitating a pop up menu right button mouse in the command menu of the filter properties window This al lows to select and load a column name in the filter command window 5 2 Syntax A Filter consists of a list of Constraints and associated Actions Example of filter Constraint 1 1 Action 1 Action 2 Constraint 2 4 Action 3 J A Constraint is a set of Conditions combined by logical operators AND OR Example of constraint Condition 1 amp amp Condition 2 A Condition applies to Parame
41. ing the image or catalogue projections Position and shortcut window the small rectangular panel above the View window is used for displaying the current position of the cursor By clicking on it you can grab the position of the last selected object or enter a shortcut com mand see section 4 3 Plane stack this is the panel at the right of the View window topped by the eye logo The status of the different planes is specified by icons and colour signals sections B 4 and HT Tool bar a set of icons between the View windows and the Plane stack gives access to control functions 8 6 Zoom window the square window at the bottom right cor ner displays a quick view of the complete field and can be used to monitor the zoom factor B 6 8 Measurement window the rectangular panel at the bottom is used for displaying data related to objects selected with mouse and cursor in the View window 6 5 2 It can be split into a separate wider window Status panel a small rectangular area between the View window and the Measurement window is mainly used for displaying status messages related to selected objects Contextual menus appear when clicking on the right button of the mouse These menus are different according to the view panels 3 4 The plane stack The interface allows the user to stack several information planes related to the same sky field to superimpose related data from catalogues and databa
42. ith the stand alone version Script commands can also be entered in the Position window sec tion 4 3 Additionally the window interface can be removed by launching Aladin with the script parameter The in line commands are get servers target radiusUnit execute a shortcut command see also section 3 to call image and data servers ex get aladin DSS2 VizieR GSC M99 load file create a new plane with the file image or data sync wait until all planes are ready save file save the current view FITS format after Sync export nn file export the plane number nn BMP formats after sync backup file generate a backup proprietary AJ format of the Aladin plane stack after sync zoom fct change zoom factor on the current view 1 2x 4x reverse on off un reverse the current view flipflop V H vertical resp horizontal pixel im age inversion cm gray BB A select the colour map RGB nl n2 n3 diff create a RGB image from plane number n1 n2 n3 a after a plane number spec ifies the ref plane contour nn no smooth zoom draw nn isocontours on the selected plane default 4 levels zoom draw the contours only on the zoom area filter name filter content create a fil ter the filter content must follow the filter instruction rules see section 6 3 7 ex S PHOT 16 draw filter name on off switch on off the sp
43. jmag S PHOT_JHN_V gt 1 Do some action draw ellipse S EXTENSION RAD SI EXTENSION RAD 1 S PHYS ECCENIRICITY 2 0 5 S POS POS ANG 5 2 4 Conditions A Condition is an arithmetic combination of Parameters fol lowed by a Comparison Operator followed by a Value The table below summarizes the allowed comparison oper ators for a numeric value Equality Inequality Greater or equals Strictly greater Less or equals Strictly less The table below summarizes the allowed comparison oper ators for a string value Operator Meaning Example case sensitive String equality Galaxy String inequality Uy When performing a comparison on strings only one param eter can be used i e combination of parameters is not allowed in this case Note there is a special condition called undefined ucd or column name which is true if the entered ucd column name is not present for the current object Example Draw black symbols for sources with no Bjmag undefined Bjmag draw black Process sources with column Bjmag You can also use the following functions abs absolute value cos COSINUS deg2rad convert degrees to radians n natural logarithm base e log base 10 logarithm rad2deg convert radians to degrees sin sinus tan tangent E g log abs S Fi S Fx gt 44 draw Daniel Egret Francois Bonnarel Pierre Fernique
44. mats uncompressed FITS compressed JPEG etc High resolution images are currently stored as subimages of 500 x 500 pixels DSS DI 768 x 768 pixels DSS ID or 1024 x 1024 pixels MAMA 6 6 Image astrometry Astrometric information comes from the FITS header of the DSS image and is generally accurate to the arcsecond However in some cases plate astrometry can be off by up to 4 preventing an absolute astrometric usage The main rea sons are 1 the pixel is 1 7 wide for the STScI images and 0 67 wide for the MAMA images 2 the error on the position given by the DSS I calibrations STScI images can be of the order of 4 on the plate edges The accuracy of the positions of one given image can easily be checked by superimposing reference astrometric catalogues such as the Tycho 2 Catalogue or the US Naval Observatory Catalogue of Astrometric Standards USNO A2 0 H You can visualize the FITS header only for the images downloaded in FITS format Select the plane of this image in the plane stack by clicking on its name and press the Prop button You will find a button to visualize its FITS header 6 7 Image compression For the ALADIN Java interface and for the ALADIN previewer the current choice is to provide the user with a slightly com pressed image in JPEG 8 bit format constructed from the orig inal uncompressed FITS images JPEG is a general purpose standard which is supported by all current Internet browsers
45. nother one at the CFHT where it is used to assist submissions for the Queue Service Observing 3 2 Getting started The typical usage scenario starts with a request of the digitized image for an area of the sky defined by its central position or name of central object to be resolved by SIMBAD This is done by pushing the Load button which opens the query panel in a new window Fig The left side of the query panel lists the different image servers starting with the Aladin image col lection at CDS while the right side lists the data and archive servers Push the button corresponding to the Aladin server type in the Target box the name object push the submit but ton and the list of all available images for the field will be dis played The user is expected to select one or several of the proposed images and to push the submit button f Server selector inl o X Choose an image server or a data server Image servers and fill in the associated form drawn below Data servers VizieR Catalogs Surveys in VizieR Aladin Aladin image database Step 1 Specify a targetiradius and press SUBMIT dede Target vec 3236 Grab coord adus Pm En SkyView Step 2 load one or several images bylistor C tree SURVEY COLOR SIZE OBS ID RESOL Simbad VLA J SERC J optical B 13 9 x13 9 D 31 444 1 7 pix SERC J optical B 1 7 x1 7 D551 444 LOW 6 7 pix NED P SERC J optical B 6 5 x6 5
46. ntre de Donn es astronomiques de Strasbourg Fig 5 Layout of the ALADIN interface window this plane type e g the Prop button displaying its properties Click and drag the plane icons to change the order of display in the stack The first active image hides all planes underneath The possible information planes can be of four different types image planes from the image data base or from obser vatory archives data planes from SIMBAD NED or VIZIER graphics labels tags Field of Views etc or filters section D 3 4 1 Image Plane Image pixels from the ALADIN database of digitized photo graphic plates DSS I MAMA DSS ID from the 2MASS sur vey from other image servers SkyView SuperCosmos or from distributed image archives e g HST Functionalities in clude zooming capabilities inverse video modification of the colour table see B 6 7 B 6 8 6 3 4 2 Simbad Information from the SIMBAD database Wenger et al 2000 objects referenced in SIMBAD are visualized by colour sym bols overlaid on top of the image the shape and colour of the symbols can be modified on request and written labels can be added for explicit identification of the objects these features are also available for all the other data planes 3 4 3 VizieR Data from the CDS library of catalogues or tables Vizier Ochsenbein et al 2000 the user can type a catalogue name or select the desired catalogue from a preselected list
47. oad button and selected the VizieR Catalogs button from the query window Fig 4 just type in the Target box the name object or its coordi nates Then the submit button provides a list of all cat alogues which have a fair chance of having at least one source in the neighbourhood of the target section 7 T Catalogues in this list can then be selected by a mouse click on their title type in the Target box the name object or its coordinates and type in the Catalogue box the acronym e g HD or CDS ADC identification of catalogue e g I11 135 a comma separated list of acronyms may be specified for sev eral catalogues e g BD CD CPD Browse the list of cata loguesf for a complete list of available catalogue acronyms or identifications you may refine the list of catalogues by submitting addi tional constraints Fig I4 by entering words in the Author free text box e g author name the list of catalogues is restricted to those having the specified word s in their description and having sources in the target neighbourhood by clicking on a selection of keywords the list of cata logues is restricted to those matching all keywords and having sources in the target neighbourhood Other Vizier alternatives are offered from the Load panel Fig I4 select the Surveys button the largest all sky surveys avail able are listed and can be selected by a mouse click on the corresponding line
48. on ALADIN Java interface and tools are developed and main tained by Pierre Ferniqud CDS Strasbourg Contour filter and data tree tools have been developed by Thomas Boch CDS Strasbourg in the framework of the Astrophysical Virtual Observatory AVO an EC RTD project 2002 2004 2 3 Aladin Standalone ALADIN Standalone is a program that you can download in order to run Aladin Java as a stand alone application on your local machine The main advantage is to overcome general se curity restrictions of on line applets you can load and save im age data on your disk print finding charts etc If you choose this solution you will have if this is not yet done to download the A adin Java package Instructions concerning the installation of these packages are given in Section B ttp cdsweb u strasbg fr people pf htm ttp cdsweb u strasbg fr boc ttp aladin u strasbg fr AladinJava frame downloading 3 Using Aladin 3 1 Access The ALADIN home page is available through the CDS Web server at the following address http This site provides access to ALADIN documentation in cluding scientific reports recent publications etc A list of the mirror sites for the ALADIN applet is also kept up to date on the home page Note that a mirror copy of the applet is available at the NASA IPAC Extragalactic Database NED where it provides access to the NED collection of FITS images featuring extragalactic objects and a
49. phical references and ac tive links to the original catalogue or database Clicking on this link will open a separate browse window with the related data or bibliography from SIMBAD NED or VizieR You can scroll up down left right the contents of the mea surement window just by clicking and dragging on it You can also split the measurement window in a separate resizeable window by clicking on the out arrow at the top right corner of the measurement panel It allows you to consult more easily long lines and long lists 3 6 The tool bar The tool bar provides a number of control tools to help visual ize the data and analyze the images 3 6 1 Properties The Prop button provides information about the properties of the selected plane 1 e the one with a framed name number of entries for data planes source and reference for image planes The Properties window pops up and it is possible to modify the configuration of the plane In particular you can change the colours or the symbol used for displaying the objects The contents of the Properties window Fig B may change according to the plane type Note that it is now possible to adjust the symbol size ac cording to a measurement of this object section DJ 3 6 2 Draw To draw lines or contours use the Draw button You have two modes click and drag mode draw a hand line click and click mode draw a poly line You have to take the cursor out of
50. r Prop or Cont tools PST s J T i i m rr z oO OK GG r a oe wm BNE Click on a plane name to select it then the tool but tons which are authorized for this kind of plane are activated Maintain the Shift key to select several planes together Click and drag the plane icons to change the order of the display in the stack The first image hides all planes underneath Delete the selected plane the one with a framed name by clicking on the Del button Each image or catalogue plane has its own projection pa rameters target radius projection method Only one of them is used at a time and other planes are projected accordingly A little black triangle at the left of the plane logo shows which plane is used as the reference projection Other planes which can also be used as reference projection are shown by an un filled triangle To change the current reference image of the view click on the little triangle in front of the logo of the new image You may create a folder to sort your different planes open a pop up menu right click with the mouse from the plane window Notice that filters section D inside a folder are active only for images below the filter inside the folder 4 2 Interacting with the VizieR database The astronomical catalogues and tables are taken from the VizieR data base Nel inl x OT Choose an image server or a data server and fill in the associated form
51. roject Incremental Release 2 and is progressively included in the Aladin image collec tion Access is also provided to other image servers currently SkyView SuperCosmos and several mirror copies of the DSS image service Other image sets are available through the Missions in Vizier feature section B 4 5 currently HST or FIRST images can be retrieved and displayed Finally user provided images in FITS format having suit able World Coordinate System information in the header can also be used through Aladin this functionality is available browsing your local directories for the Java stand alone ver sion section 8 2 It is also available for the Java applet version for personnal files accessible through a URL section B 4 7 6 2 DSS Images The database currently includes the first and second Digitized Sky Survey DSS I and DSS II produced by the Space 7 http www ipac caltech edu 2mass 16 Daniel Egret Francois Bonnarel Pierre Fernique Thomas Boch Olivier Bienaym ALADIN User s Manual i 10 x Load Save VOPIlot Print Help Quit j2000 00 42 00 57 41 06 04 5 Field 00 42 44 10 41 16 06 0 34 eS xx ES P M ue r L A No Ss e i r gt ae as ey a Tt LM ey be i n ae DOSE tes xcd a AT er BEES Ou SY Se wer 2 nep test 6 8 e we Mitos cie 41 t6 ut AS Cairo 4 4 EAE LX g SKI z i matt M aL F Leo ae
52. sec 154m sampling interval DSS II images in the B band come from POSS II J DSS II images in the band come from Palomar POSS II N and SERC I The blue plates POSS I O are progressively included 6 3 MAMA CAI Images High resolution digitization of POSS II SERC J SERC ER SERC SR SERC I or ESO R plates featuring crowded re gions of the sky Galactic Plane and Magellanic Clouds have been provided by the MAMA facility at the Centre d Analyse des Images CAI Observatoire de Paris Sampling is 0 67 per pixel 101m These images are better suited to visual inspection of very faint objects 6 4 2MASS near infrared survey 2MASS J H and Kg images are the original slightly com pressed images from the 2MASS survey They are currently not recomputed this means that the retrieved image field includes the requested position but is not centered on this position as this is done for the high resolution DSS images 6 5 The image server DSS images are generally available in the following resolu tions the Full resolution about 10x10 arcmin corresponding to the original digitizations the Low resolution about 1 5x1 5 degrees providing an intermediate view consistent with the field of view of major telescopes DSS I images only the Global Plate view about 5x5 degrees reproducing the photographic Schmidt plates The image server for ALADIN is able to deal with various survey data in heterogeneous for
53. ses and to obtain interactive access to the original data The user s eye symbolized by the eye logo sees the projec tion of all active planes in the View window A specific icon shows the type of a plane image data graphical element or filter The status of a plane is specified by a coloured signal to the right of its name flashing when the data are being retrieved green when the data have been successfully retrieved red when the query failed orange for warning e g no astrometric reduc tion A black triangle at the left of the plane logo shows which plane is used as the reference projection see section H T for more details on how to use the plane stack You can click on a plane icon to activate or deactivate it the icon is dark when the plane is active When clicking on the plane name you select it for the control buttons authorized for ELLE v2 0 Pile x Load Save VOPlIot Print Help Quit J2000 22 57 53 96 26 08 00 3 Field 22 57 57 70 26 08 57 7 12 9 x12 9 NGC 7436 i 9 POSSILJ DSS2 Zoom 1x WBL 692 Click on it enclose it to see the measurements E gaa apanga 26 149904115 661 12 745 12 406 eee 222 1111000 2 0 0 07 0 96 01 0 0771 9 077 sin esa zl L NGC 7436 moc zaa 1 Measurement window 0 024627 ref i22 E NGC 7436A Eo a NGC 7436 p 700 001 sol d i c ULP CNRS 1999 2004 Ce
54. sures 381 Krow Chandra Log of Chandra X ray Satellite 5Krow ESO Archives ESO 583Krow FIRST The FIRST Radio Survey S50Krow Surveys in VizieR Missions in VizieR SkyView Simbad vili NED HUT Log of Hopkins Ultraviolet Telescope 1Krow INT The Isaac Newton Telescope observation log 8Krow ISO Log of ISO validated data 23Krow IUE IUE Ultraviolet Spectra 109Krow MERLIN The MERLIN interfero eter at Jodrell Bank 2Krow xMMlog Log of XMM X ray Satellite 16Krow Others be title Others Get info rev SUBMIT Metadata Reset Clear Close H Own data i MyData Fig 6 Load panel for Mission logs and image archives An example of data extracted from the HST mission log can be seen in Fig 7 r Oa MS AUMP RENNES 0 B hst hst Gu M16 18 18 51 06 13 49 51 WFPC2 or M16 18 18 51 06 13 49 51 1 WFPC2 501 3 MBassociation capey 274 7128 13 8309 1995 04 01T17 15 17 2200 0 M16 A 274 7128 13 8309 1995 04 01T18 42 17 2200 0 M16 A Association CADC 274 7128 13 8309 1995 04 01T20 24 17 2200 0 mi16 a EEES Glu tag amp getReadMe B hst gt Fig 7 Querying image archives the archive log contains point ers to the actual images indicated by Image buttons in the cor responding lines of the Measurement window See Fig for an example of HST image display http nedwww ipac caltech
55. ter images are intended for studies of crowded regions of the southern sky such as the southern Galactic Plane Additionally Aladin Java allows one to access other archive images such as HST SUPERCosmos FIRST NYSS Merlin XMM Newton Chandra and all images provided by SkyView HEASARC Access to Aladin applet Fr US Jp Ru In UK Ca in your the service browser without any installation 394KB java 1 1 4 Fig 1 Home page of ALADIN at the CDS Web site 1 2 The CDS The Centre de Donn es astronomiques de Strasbourg CDS defines develops and maintains services to help astronomers find the information they need from the very rapidly increasing wealth of astronomical information A detailed description of the CDS on line services can be found e g in Genova et al 2000 or at the CDS web site 2 The user interfaces ALADIN is currently available in three main modes ALADIN previewer java applet java stand alone version 2 1 Aladin previewer The ALADIN previewer is a pre formatted image server pro viding a compressed image of fixed size around a given ob ject or position either in full resolution 14 1 x 14 1 for the DSS I used as default reference atlas or as a global plate view approximately 6 x 6 according to the survey When an ob ject name is given its position is resolved through the SIMBAD name resolver Z Aladin previewer Microsoft Internet Explorer ioj x Fichier E
56. ters or combination of pa rameters Examples of conditions Condition 3 Value Parameter 2 Parameter gt Parameter 1 Value Parameters are specified via the corresponding column names or UCDs Unified Content Descriptors Examples of parameters via UCD S PHOT_JHN_V via column name Vmag A Value can be a numeric value or a string value The global structure is quite similar to a switch structure in C which would have a break statement at the end of each case It means that if a source verifies one constraint the program will not run into following cases for this source Note for a given constraint the list of actions immediately follows the constraint and must be embraced by brackets Each action has to be separated either by a carriage return or by a semicolon Figure I7 illustrates how a filter is applied to a set of sources If a source verifies the first constraint then each cor responding action is made and the next source is processed If it doesn t the program checks whether the source verifies the next constraint and so on until there are no more blocks If the source verifies no constraint at all it is not drawn 5 2 1 Invocating columns In constraints and in the parameters of actions UCDs and col umn names have to be pointed out in a specific way 12 Daniel Egret Francois Bonnarel Pierre Fernique Thomas Boch Olivier Bienaym ALADIN User s Manual BEGIN
57. tion 1 1 The ALADIN interactive sky atlas ALADIN is an interactive sky atlas developed and maintained by the Centre de Donn es astronomiques de Strasbourg CDS for the identification of astronomical sources through visual analysis of reference sky images Bonnarel et al 2000 ALADIN fully benefits from the environment of CDS databases and services SIMBAD reference database VizieR catalogue service etc and is designed as a multi purpose ser vice for use by the professional astronomical community ALADIN allows the user to visualize digitized images of any part of the sky to superimpose entries from the CDS as tronomical catalogues and tables and to interactively access related data and information from SIMBAD NED VizieR or other archives for all known objects in the field ALADIN is particularly useful for multi spectral cross identifications of astronomical sources observation prepara tion and quality control of new data sets by comparison with standard catalogues covering the same region of sky The ALADIN interactive atlas is available in three main modes a simple previewer a java applet and a java stan dalone application to be downloaded by the user ALADIN is publicly accessible on the World Wide Web at the address Aladin Service Microsoft Internet Explorer ioj xj Fichier Edition Affichage Favoris Outils ae Adresse http aladin u strasbg fr aladin gml X OK
58. ues is returned It is possible at this stage either to list all catalogues or to pro duce a subset selected on the basis of keywords as explained in section Z Note that as the index pixels generally match an area larger than the current sky field there is simply a good chance but not 10046 to actually obtain entries in the field when query ing one of the selected tables 7 2 Archive previews In order to access image from archives you should first query the VizieR service for the mission log of the archive for ex ample the HST log or the FIRST log around a target see sec tion B 4 5 Secondly you select the resulting positions in the View window and look at the corresponding data in the Measurement window If you find a button Image in the data line click on it to retrieve the corresponding archive image Fig A new plane will be created automatically in the stack 8 Specific features of the Stand alone version ALADIN Standalone is a program that you can download in order to run Aladin Java as a standalone application on your local machine The main advantage is to overcome Java security restric tions you can load and save image data on your disk print fields etc If you choose this solution you should first down load the Aladin Java package ttp aladin u strasbg fr AladinJava frame downloading inl x Quit 18 52 02 5 12 91 12 91 Antennae S a Load Save
59. urce of the image are given in the corresponding window right It is also possible to modify the projection of the data points or the astrometric registration of the image 3 6 3 Text Tags You can display text or mark objects with tags by pushing the related Text or Tag button 3 6 4 Distance Dist Fig 10 Example of display obtained when using the Dist but ton The Dist button activates an Overplot measurer allowing you to draw vectors in the View window the corresponding angular distance differences in right ascension and declination and position angle appear in the Status panel below the View window Fig TO 3 6 5 RGB colour composition If you have load two or three images covering the same field you can call the RGB colour composition by pushing the rgb button A popup window will be displayed allowing you to se lect which images will be assigned red green and blue colours Astrometric registration will be computed using by default the highest resolution image as a reference You can also use the ALADIN previewer that can provide directly a color RGB image Fig 8 Daniel Egret Francois Bonnarel Pierre Fernique Thomas Boch Olivier Bienaym ALADIN User s Manual 3 6 6 Contour plots The cont button can be used to draw isocontours computed from the selected current image these contours can be overlaid on other images as illustrated in fig TT Fj PETERS v2 0 2
60. y hardware and operating system To be exe cuted it needs a virtual machine i e a program analyzing the binary code and executing the instructions This virtual ma chine is dependent on hardware and operating system Two types of Virtual Machines exist those included inside current Web Browsers and those running as an independent program 8 1 2 The AladinJava Stand alone package The AladinJava Standalone package is packaged by InstallAnywhere by ZeroG http www zerog com The package includes the Aladin code and an embedded Java Virtual Machine 18 Daniel Egret Francois Bonnarel Pierre Fernique Thomas Boch Olivier Bienaym ALADIN User s Manual NGC 3314 10 37 12 55 27 41 05 7 z Pet 10 37 30 Q NGC 3314 14 18 arcmin x 14 16 arcmin O Tycho Z USNO2 X GSC12 9 Simbad Fig 23 Postcript printout of a DSS I field featuring NGC 3314 produced from the Standalone version The installation does not require any special privilege but depends on your operating system see the Aladin standalone installation web page Executing the Aladin Standalone code will also depend on your operating system for instance an icon menu under Mac and Windows Aladin command under Unix etc The stan dalone version can also be started with a java command line java jar Aladin jar Notice that InstallAnywhere provides a script to uninstall the codes 8 2 Loading personal files with Aladin Standalone The
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