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Title: Template-based classification of SDSS-GALEX point sources
Authors: Anjum, A
Mousumi Das
Murthy, J
Gudennavar, S. B
Rajesh, G
Bubbly, S. G
Keywords: QSOs;Photometric classification;Point-sources;SDSS-GALEX;SED fitting;UV-optical photometry
Issue Date: Oct-2018
Publisher: Indian Academy of Sciences
Citation: Journal of Astrophysics and Astronomy, Vol. 39, No. 5, 61
Abstract: We have classified a sample of 37,492 objects from SDSS into QSOs, galaxies and stars using photometric data over five wave bands (u,g,r,i and z) and UV GALEX data over two wave bands (near-UV and far-UV) based on a template fitting method. The advantage of this method of classification is that it does not require any spectroscopic data and hence the objects for which spectroscopic data is not available can also be studied using this technique. In this study, we have found that our method is consistent by spectroscopic methods given that their UV information is available. Our study shows that the UV colours are especially important for separating quasars and stars, as well as spiral and starburst galaxies. Thus it is evident that the UVbands play a crucial role in the classification and characterization of astronomical objects that emit over a wide range of wavelengths, but especially for those that are bright at UV. We have achieved the efficiency of 89% for the QSOs, 63% for the galaxies and 84% for the stars. This classification is also found to be in agreement with the emission line diagnostic diagrams.
Description: Open Access
ISSN: 0250-6335
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Appears in Collections:IIAP Publications

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