Photometric Selection of QSO Candidates from GALEX Sources

We present a catalog of 36,120 QSO candidates from the Galaxy Evolution Explorer (GALEX) Release Two (GR2) UV catalog and the USNO-A2.0 optical catalog. The selection criteria are established using known quasars from the Sloan Digital Sky Survey (SDSS). The SDSS sample is then used to assign individ...

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Bibliographic Details
Published in:The Astrophysical journal 2007-07, Vol.664 (1), p.53-63
Main Authors: Atlee, David W, Gould, Andrew
Format: Article
Language:English
Subjects:
Astronomy
Earth, ocean, space
Exact sciences and technology
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Summary:We present a catalog of 36,120 QSO candidates from the Galaxy Evolution Explorer (GALEX) Release Two (GR2) UV catalog and the USNO-A2.0 optical catalog. The selection criteria are established using known quasars from the Sloan Digital Sky Survey (SDSS). The SDSS sample is then used to assign individual probabilities to our GALEX USNO candidates. The mean probability is -50% and would rise to similar to 65% if better morphological information than that from USNO were available to eliminate galaxies. The sample is similar to 40% complete for i less than or equal to 19.1. Candidates are cross Identified in 2MASS, FIRST, SDSS, and the XMM-Newton Slewing Survey (XMMSL1), whenever such counterparts exist. The present catalog covers the 8000 deg super(2) of GR2 lying above degree 'b degree ' = 25 [unk], but can be extended to all 24,000 deg super(2) that satisfy this criterion as new GALEX data become available.
ISSN:0004-637X
1538-4357
DOI:10.1086/518467