跳出彩色盒子思考：可能的目标选择和SDSS-XDQSO类星体目标目录
Think Outside the Color Box: Probabilistic Target Selection and the SDSS-XDQSO Quasar Targeting Catalog
摘要：
我们提出了SDSS-XDQSO类星体目标目录，用于有效的基于通量的类星体目标选择，直到斯隆数字巡天（SDSS）目录的微弱极限，即使在中等红移（2.5 <~ z <~ 3）的恒星污染是显着的。我们建立模型的恒星和类星体的分布在通量空间的流量限制，通过应用极端反褶积方法来估计底层的密度。我们卷积这个密度与通量的不确定性时，评估的概率，一个对象是类星体。这种方法产生了比其他类似方法更有原则、更有效和更快的靶向算法。我们应用该算法计算了SDSS数据Release 8中160，904，060个点源的低红移（z < 2.2）、中红移（2.2 <= z <= 3.5）和高红移（z > 3.5）类星体的概率，这些点源的去红i波段星等在17.75等和22.45等之间，成像角度为14，555度^[2]。该星表可以用来定义一个统一选择和有效的低或中等红移类星体调查，如SDSS-III的重子振荡光谱调查项目所需的。我们表明，XDQSO技术的表现以及目前最好的光度类星体选择技术在低红移，并优于所有其他基于通量的方法来选择我们的主要兴趣的中等红移类星体。我们制作代码来复制XDQSO类星体目标选择公开提供。
英文摘要：
We present the SDSS-XDQSO quasar targeting catalog for efficient flux-based quasar target selection down to the faint limit of the Sloan Digital Sky Survey (SDSS) catalog, even at medium redshifts (2.5 <~ z <~ 3) where the stellar contamination is significant. We build models of the distributions of stars and quasars in flux space down to the flux limit by applying the extreme-deconvolution method to estimate the underlying density. We convolve this density with the flux uncertainties when evaluating the probability that an object is a quasar. This approach results in a targeting algorithm that is more principled, more efficient, and faster than other similar methods. We apply the algorithm to derive low-redshift (z < 2.2), medium-redshift (2.2 <= z <= 3.5), and high-redshift (z > 3.5) quasar probabilities for all 160,904,060 point sources with dereddened i-band magnitude between 17.75 and 22.45 mag in the 14,555 deg^2 of imaging from SDSS Data Release 8. The catalog can be used to define a uniformly selected and efficient low- or medium-redshift quasar survey, such as that needed for the SDSS-III's Baryon Oscillation Spectroscopic Survey project. We show that the XDQSO technique performs as well as the current best photometric quasar-selection technique at low redshift, and outperforms all other flux-based methods for selecting the medium-redshift quasars of our primary interest. We make code to reproduce the XDQSO quasar target selection publicly available.
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