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Paper: Chapter 17: Web-based Tools—Spectrum and Filter Services for the VO
Volume: 382, The National Virtual Observatory: Tools and Techniques for Astronomical Research
Page: 147
Authors: Dobos, L.; Budavari, T.
Abstract: We present the Filter and Spectrum Services consisting of easy-to-use web applications and web services for searching, plotting and managing large collections of spectral energy distribution data and filter profiles as well as for performing various scientific operations on spectra in a unified framework. The services provide keyword search, advanced query forms and SQL query possibilities for selecting spectra or bandpass curves which may be retrieved in a variety of file formats including XML, VOTable and ASCII. All SDSS DR1-DR5 spectra had been loaded into a database as well as the entire 2dF catalog that adds up to more than 2.5 million SEDs of about a million spatial objects, but registered users can upload their own data making it available for the rest of the community and are free to modify or delete them at any time. Theoretical catalogs, such as the Bruzual-Charlot stochastic burst model spectrum library (100k spectra) and the BaSeL stellar library are also available. Scientific services allow building rest-frame composite spectra out of selected spectra; calculating synthetic magnitudes by convolving spectra with an arbitrary set of bandpass curves of optical instrument filters to generate simulated photometric catalogs on-thefly; galactic extinction correction, fitting of the continuum using different set of templates (Bruzual-Charlot ‛03 templates, SDSS eigenspectra), line fitting. All scientific functionality is available from the web user interface and via the SOAP web services for programmers. MySpectrum is a cross-platform version of the spectrum web service for setting up your own spectrum repository. It integrates into the main service allowing easy access to your data for the whole VO community.

The main idea behind our web services is to move scientific functionality physically close to the database in order to spare network bandwidth. This way scientists may do research without setting up expensive hardware, downloading large datasets for days or weeks or installing complicated software.

Spectrum Services can be found at The Filter Service is at

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