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The Ultraviolet, Optical, and Infrared Properties of Sloan Digital Sky Survey Sources Detected by GALEX
Journal article   Open access

The Ultraviolet, Optical, and Infrared Properties of Sloan Digital Sky Survey Sources Detected by GALEX

Marcel A Agueros, Zeljko Ivezic, Kevin R Covey, Mirela Obric, Lei Hao, Lucianne M Walkowicz, Andrew A West, Daniel E Vanden Berk, Robert H Lupton, Gillian R Knapp, …
The Astronomical journal, v 130(3), pp 1022-1036
01 Sep 2005
DOI: https://doi.org/10.1086/432160
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https://doi.org/10.1086/432160View
Published, Version of Record (VoR) Open

Abstract

We discuss the ultraviolet, optical, and infrared properties of the Sloan Digital Sky Survey (SDSS) sources detected by the Galaxy Evolution Explorer (GALEX) as part of its All-sky Imaging Survey Early Release Observations. Virtually all (>99%) the GALEX sources in the overlap region are detected by SDSS; those without an SDSS counterpart within our 6'' search radius are mostly unflagged GALEX artifacts. GALEX sources represent ~2.5% of all SDSS sources within these fields, and about half are optically unresolved. Most unresolved GALEX-SDSS sources are bright (r < 18 mag), blue, turnoff, thick-disk stars and are typically detected only in the GALEX near-ultraviolet (NUV) band. The remaining unresolved sources include low-redshift quasars (z < 2.2), white dwarfs, and white dwarf-M dwarf pairs, and these dominate the optically unresolved sources detected in both GALEX bands.

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Astronomy & Astrophysics
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