http://star-www.dur.ac.uk/~pdraper/splat/splat-vo/
SPLAT is a graphical tool for displaying, comparing, modifying and analysing astronomical spectra stored in NDF, FITS and TEXT files as well as the new NDX format. SPLAT is now part of the STARJAVA collection.
It can read in many spectra at the same time and then display these as line plots. Each display window, of which there can be many, can be used to view one or several spectra at the same time. Display windows can be interactively zoomed and scrolled, centered on specific wavelengths, provide continuous coordinate readout, produce printable hardcopy and be configured in many ways. They also provide the basis for interactive analysis facilities. All of these functions are displayed in a visually rich format, that is intended to appeal especially to casual users of spectral data analysis facilities, as it includes some facilities such as drag-and-drop and undoable editing.
The current set of analysis facilities include the fitting of a polynomial to selected parts of a spectrum, the fitting of Gaussian, Lorentzian and Voigt profiles to emission and absorption lines and the filtering of spectra using average, median and line-shape window functions as well as wavelet denoising. A database of laboratory line positions is available to aid in identification.
SPLAT also supports a full range of coordinate systems for spectra, using the latest facilities of the Starlink AST library. This allows coordinates to be displayed and aligned in many different coordinate systems (wavelength, frequency, energy, velocity) and transformed between these and different standards of rest (topocentric, heliocentric, dynamic and kinematic local standards of rest etc.).
The Starlink Spectral Analysis Tool (SPLAT) has been upgraded to include a toolbox for querying, downloading and displaying spectra from the current generation of SSAP servers. This is now part of the official SPLAT release, which comes with JAC Starlink.
More recently SPLAT has been updated (by
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) so that it can interoperate with other SAMP aware applications, such as TOPCAT and the SSAP support has been updated to version 1.0. This version is available here.
http://star-www.dur.ac.uk/~pdraper/splat/splat-vo/
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This latest version of SPLAT is available as a download for installing onto your desktop:
SPLAT-VO installer (100Mb)
or as a webstart application:
SPLAT-VO webstart
The changes are described in the NEWS file.
Both versions will run using Linux (glibc2.3), Windows (XP/Vista 32bit), Mac OS X (10.4 ppc & 10.4 i386) and Solaris (8+). The installer is an executable jar file so you just need to run this using the command:
java -jar splat-vo.jar
After downloading it. If you install SPLAT-VO locally then it may integrate into your desktop or alternatively (for UNIX only) you can run it by executing the splat script located in the <root>/bin/splat directory.
Vista users should note that the installer will not install into system directories. Use a user-specific directory instead.
SPLAT-VO is part of the Starlink STARJAVA package and is available under the GPL.
The complete documentation (which is also available in the on-line help) is available as SUN/243
Highlights of these changes, besides being able to make SSAP queries, are the matching of spectral coordinates and fluxes between spectra. Spectral coordinates include the full range described in FITS WCS Paper III, that is wavelength, frequency, energy and velocity etc. These can be described in various rest frames -- topocentric, heliocentric, dynamic and kinematic local -- and can be transformed between them all.
Differences between data value units can be automatically taken account of when overlaying spectra as long as the units strings conform to the system described in FITS WCS paper I. Also, automatic identification and conversion between flux per unit wavelength and flux per unit frequency is provided and does not require any "dimensional analysis" information to be present
These two systems will be extended to include others such as magnitude and antenna temperature that require additional meta-data to fully describe the inter-system transformations. All coordinate and flux transformations are handled by the Starlink AST package, developed by Rodney Warren-Smith and David Berry (
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). AST also provides the plotting facilities used for drawing spectra in SPLAT-VO.
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