SPLAT - Spectral Analysis Tool

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SPLAT - Spectral Analysis Tool

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 main source of documentation for SPLAT is Starlink User Note 243, which is also the on-line help. If you have SPLAT installed on your machine then you should be able to view this using the "Help" menu. Otherwise (if you just want a look) you can find it on-line, you can get a hardcopy here.

Initially you should work you way through the getting started, displaying more than one spectrum and basic control of a plot view sections.

Release notes

A list of the latest changes to SPLAT can be found in the NEWS file.

Obtaining SPLAT

SPLAT is part of the STARJAVA collection available in the {CURRENT} release from EAO. For a standalone installation look in the SPLAT-VO support page which can be more recent. Also see the SPLAT-VO page for news about the GAVO version of SPLAT. This is a new development that is providing the improvements in the VO facilities of SPLAT.

Questions or comments to: p.w.draper@durham.ac.uk.

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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