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Photometric Selection of QSO Candidates From GALEX Sources

By David W. Atlee and Andrew Gould


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 ∼ 65 % if better morphological information than that from USNO were available to eliminate galaxies. The sample is ∼ 40 % complete for i ≤ 19.1. Candidates are cross-identified in 2MASS, FIRST, SDSS, and XMM-Newton Slewing Survey (XMMSL1), whenever such counterparts exist. The present catalog covers the 8000 deg 2 of GR2 lying above |b | = 25 ◦ , but can be extended to all 24000 deg 2 that satisfy this criterion as new GALEX data become available. Subject headings: quasars:general 1

Year: 2007
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