Using SPLAT with the VO

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Note this is now out-of-date.

Browser Window

This image shows the browser window of SPLAT. This is the main window where a list of all the spectra (and their plotting properties) is maintained (the Global list of spectra:). To interact with the VO you need to select the SSAP item in the File menu, or you can press the toolbar button.

Query VO for Spectra

This window provides basic access to the VO. Using it you can query the current list of SSAP servers (Simple Spectral Access Protocol) for lists of the spectra that they hold about a circular region on the sky. You can then select which of these you are interested in and download these into SPLAT-VO.

To locate an object you can look it's celestial coordinates (using SIMBAD or NED, see the Resolver menu), that's what's shown above (you press Lookup and the RA: and Dec: fields are filled), or you can just type in the coordinates, which can also be in decimal degress (all coordinates are assumed to be in FK5/J2000). The Radius field is the number of arcminutes to search around the position. Now that we've done that we can press Go and the search will be performed.

The search is done asynchronously so that each of the SSAP servers responds when it can. You can cancel any query that seems to be unresponsive. Close that window and you'll now see that the Query results: area is now filled with a series of tabs that, when pressed, reveal the spectra available from each server.

The simplest way to download a spectrum is to double click on the line. Alternatively you can select as many spectra as you want (using the usual Control-click to add more spectra to a selection, or Shift-click to select a range) and then press Display selected. Pressing Display all may seem like a good idea, but you'll need to be patient.

Once a spectrum has been downloaded it will appear in the Global list and be displayed in a plot window.

If you download more than one spectrum they will be displayed in the same plot.

The following is a selected set of spectra for a similar search based around the position of Beta UMi.

Configuring the SSAP servers

The SSAP servers used during the query may be configured using the Options Configure SSAP servers... dialog window (or you can just press ).

Using this window you can remove any servers that you don't want to query and, more importantly, you can query the registry of SSAP servers for any new services (the initial set used are a static list). You do this by pressing the Query registry button. Subsets of services can be created and saved/restored.

Questions or comments to:

Copyright © 2005 Central Laboratory of the Research Councils
Copyright © 2006 Particle Physics and Astronomy Research Council
Copyright © 2008-2009 Science and Technlogy Facilities Council
Copyright © 2009-2013 Peter W. Draper
Last modified: 02-Jun-2016
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