FORS Spectrum Access
Retrieval of FORS1+2 1d Spectra
A prototype version of the SSA query interface was released at ESO on Jan. 11, 2004. It is accessible through the VODemo tab of the server selector dialog of AVO prototype V0.945 or higher.
Note: The special GLU dictionary necessary with V0.944 is obsolete and should be removed from the local installation directory.
Recipe for testing
- load a background image, e.g. WFI, of CDFS
- load the Szokoly catalog file from your local disk as a reference
- search in the VOtest tab "FORS spectra from ESO"
- right click on the SSA result table and choose "Create a catalog plane with all spectra"
- select some spectra in the newly created overlay
- load a spectrum into Specview by pressing the "Spectrum" button in the measurement frame
For developers
The GLU entry
%ActionName FORS_SPECTRA.SSA
%Description SSA server for VLT/FORS spectra
%Aladin.Label SSA server for VLT/FORS spectra
%Aladin.Menu VOtest
%Aladin.LabelPlane FORS-Spectra $1
%DistribDomain ALADIN
%Owner CDS'aladin
%Url http://www.euro-vo.org/bin/xfors?pos=$1,$2&size=$3
%Param.Description $1=Right Ascension
%Param.Description $2=Declination
%Param.Description $3=Radius in deg
%Param.DataType $1=Target(RAd)
%Param.DataType $2=Target(DEd)
%Param.DataType $3=Field(RADIUSd)
%Param.Value $3=0.1
%ResultDataType Mime(ssa/xml)
The metadata and query modes were partially implemented, however, all the functionality needed for the AVO demo is in place.
Metadata mode
http://www.euro-vo.org/bin/xfors?format=metadata
Returns the usage of this service in VOTable format.
Query mode
http://www.euro-vo.org/bin/xfors?pos=53.148833056,-27.82111083&size=0.01&bandpass=optical,infrared
Further query parameters are available or in the process of being implemented. Note that the query mode returns VOTable and the trieval mode actual data.
Retrieval mode
It is possible to use the retrieval mode directly to load FORS1+2 1d spectra into Specview or to the local disk. As input parameter one needs to specify the object ID as defined in the catalogue by Szokoly et al. which has just been published.
- If your OS supports aliases create a shortcut called spv like this:
alias spv "java -cp AVO.jar spv.Specview http://www.euro-vo.org/bin/xfors\?specid=cdf_\!^\&format=fits &"
- load the catalogue into the AVO prototype and look for the ID table column
- load spectra of interesting objects, for instance:
TERMINAL> cd AVO_INSTALLATION_DIRECTORY
TERMINAL> spv 45
TERMINAL> spv 36b
...
One can include access references like below ones in IDHA trees:
Spectra are also available in GIF and EPS format:
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