Photometric Selection of QSO Candidates From GALEX Sources

We present a catalog of 36 120 QSO candidates from the GALaxy Evolution EXplorer (GALEX) 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 relatively crude morphological information 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), wherever such counterparts exist. The present catalog covers the 8000 deg of GR2 lying |b| > 25, but can eventually be extended to all 24 000 deg that satisfy this criterion. Subject headings: quasars:general