南方宇宙学巡天III：来自组合GALEX和光学测光的QSO
Southern Cosmology Survey III: QSO's from Combined GALEX and Optical Photometry
摘要：
我们目前的类星体候选人的目录选择使用测光从GALEX结合SDSS在条纹82区域和布兰科宇宙学调查（BCS）近10 - 55度。SDSS区域在~60平方度的天空区域中包含~700个星等i < 20的物体和~3600个i < 21.5的物体，而BCS区域在11平方度的天空区域中包含~280个星等i < 20的物体和~2000个i < 21.5的物体，目前正在进行三次微波Sunyaev-Zeldovich调查。我们的QSO目录是BCS地区的第一个。深GALEX曝光（FUV和NUV中约2000秒，三个视场除外）在GALEX波段（FUV，NUV < 24.5 mag）提供高信噪比测光。从这些数据中，我们使用Atlee和Gould（2008）给出的方法，仅使用GALEX和光学r波段测光来选择类星体候选者。在Stripe 82场中，60%（30%）的GALEX选择的光学星等i<20（i<21.5）的类星体也出现在Richards等人（2008）使用5波段光学SDSS测光构建的类星体目录中。与Richards等人的相同星表比较，样本的完整性约为40%（25%）。然而，对于天空中尘埃消光非常低的区域，如BCS 23小时场和RA 0至10度之间的条纹82，我们的完整性接近95%，这表明深GALEX观测在寻找类星体方面几乎与多波长观测一样有效。GALEX观测因此提供了一个可行的替代路线，类星体目录在天空区域的u波段光学测光是不可用的。完整的目录可在http://www.ice.csic.es/personal/jimenez/PHOTOZ上获得
英文摘要：
We present catalogs of QSO candidates selected using photometry from GALEX combined with SDSS in the Stripe 82 region and Blanco Cosmology Survey (BCS) near declination -55 degrees. The SDSS region contains ~700 objects with magnitude i < 20 and ~3600 objects with i < 21.5 in a ~60 square degree sky region, 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 being observed by three current microwave Sunyaev-Zeldovich surveys. Our QSO catalog is the first one in the BCS region. Deep GALEX exposures (~2000 seconds in FUV and NUV, except in three fields) provide high signal-to-noise photometry in the GALEX bands (FUV, NUV < 24.5 mag). From this data, we select QSO candidates using only GALEX and optical r-band photometry, using the method given by Atlee and Gould (2008). In the Stripe 82 field, 60% (30%) of the GALEX selected QSO's with 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 with the same catalog by Richards et al. shows that the completeness of the sample is approximately 40%(25%). However, for regions of the sky with very low dust extinction, like the BCS 23hr field and the Stripe 82 between 0 and 10 degrees in RA, our completeness is close to 95%, demonstrating that deep GALEX observations are almost as efficient as multi-wavelength observations at finding QSO's. GALEX observations thus provide a viable alternate route to QSO catalogs in sky regions where u-band optical photometry is not available. The full catalog is available at http://www.ice.csic.es/personal/jimenez/PHOTOZ
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