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We present catalogs of QSO candidates selected using photometry from GALEXcombined with SDSS in the Stripe 82 region and Blanco Cosmology Survey (BCS)near declination -55 degrees. The SDSS region contains ~700 objects withmagnitude i < 20 and ~3600 objects with i < 21.5 in a ~60 square degree skyregion, while the BCS region contains ~280 objects with magnitude i < 20 and~2000 objects with i < 21.5 for a 11 square degree sky region that is beingobserved by three current microwave Sunyaev-Zeldovich surveys. Our QSO catalogis the first one in the BCS region. Deep GALEX exposures (~2000 seconds in FUVand NUV, except in three fields) provide high signal-to-noise photometry in theGALEX bands (FUV, NUV < 24.5 mag). From this data, we select QSO candidatesusing only GALEX and optical r-band photometry, using the method given by Atleeand Gould (2008). In the Stripe 82 field, 60% (30%) of the GALEX selected QSO'swith optical magnitude i<20 (i<21.5) also appear in the Richards et al. (2008)QSO catalog constructed using 5-band optical SDSS photometry. Comparison withthe same catalog by Richards et al. shows that the completeness of the sampleis approximately 40%(25%). However, for regions of the sky with very low dustextinction, like the BCS 23hr field and the Stripe 82 between 0 and 10 degreesin RA, our completeness is close to 95%, demonstrating that deep GALEXobservations are almost as efficient as multi-wavelength observations atfinding QSO's. GALEX observations thus provide a viable alternate route to QSOcatalogs in sky regions where u-band optical photometry is not available. Thefull catalog is available at http://www.ice.csic.es/personal/jimenez/PHOTOZ

Southern Cosmology Survey III: QSO's from Combined GALEX and Optical Photometry