条纹82 X中X射线和WISE AGN的SDSS-IV eBOSS光谱学：X射线和中红外选定活动星系核的人口统计学概述
SDSS-IV eBOSS Spectroscopy of X-ray and WISE AGN in Stripe 82X: Overview of the Demographics of X-ray and Mid-Infrared Selected Active Galactic Nuclei
摘要：
我们报告的结果斯隆数字巡天IV eBOSS计划的目标X射线源和中红外选择的WISE活动星系核候选人在36.8度$^2$地区的条纹82。大约一半的调查（15.6度$^2$）覆盖了条纹82 X射线调查的最大连续部分。该计划代表了对活动星系核候选者的最大的光谱调查，这些候选者仅仅是通过它们的WISE颜色来选择的。我们结合这个样本与X射线和智慧活动星系核领域确定通过其他来源的光谱，产生一个目录的4847来源，是82%的完整$r\sim22$。根据X射线亮度或WISE颜色，这些源中有4730个是活动星系核，其平均红移为$z\sim1$。大约30%的活动星系核是光学模糊的（即，在它们的光谱中缺少宽线）。然而，BPT分析表明，$z<0.5$上50%的WISE活动星系核具有与恒星形成星系一致的发射线比率，因此目前还不清楚它们是被掩埋的活动星系核还是恒星形成星系的污染物。我们发现61%的X射线活动星系核没有被WISE选作MIR活动星系核，22%的X射线活动星系核没有被WISE探测到。后者的活动星系核大多数都有高的X射线光度（$L_{\rm x} > 10^{44}$ erg s $^{-1}$），这表明MIR的选择错过了相当大一部分最高光度的活动星系核，以及较低光度的活动星系核加热的尘埃不占主导地位的MIR发射源。相反，WISE AGN的58%的$\sim$没有被X射线探测到，尽管我们没有发现它们比X射线探测到的WISE AGN更红。
英文摘要：
We report the results of a Sloan Digital Sky Survey-IV eBOSS program to target X-ray sources and mid-infrared-selected WISE AGN candidates in a 36.8 deg$^2$ region of Stripe 82. About half this survey (15.6 deg$^2$) covers the largest contiguous portion of the Stripe 82 X-ray survey. This program represents the largest spectroscopic survey of AGN candidates selected solely by their WISE colors. We combine this sample with X-ray and WISE AGN in the field identified via other sources of spectroscopy, producing a catalog of 4847 sources that is 82% complete to $r\sim22$. Based on X-ray luminosities or WISE colors, 4730 of these sources are AGN, with a median sample redshift of $z\sim1$. About 30% of the AGN are optically obscured (i.e., lack broad lines in their optical spectra). BPT analysis, however, indicates that 50% of the WISE AGN at $z<0.5$ have emission line ratios consistent with star-forming galaxies, so whether they are buried AGN or star-forming galaxy contaminants is currently unclear. We find that 61% of X-ray AGN are not selected as MIR AGN, with 22% of X-ray AGN undetected by WISE. Most of these latter AGN have high X-ray luminosities ($L_{\rm x} > 10^{44}$ erg s$^{-1}$), indicating that MIR selection misses a sizable fraction of the highest luminosity AGN, as well as lower luminosity sources where AGN heated dust is not dominating the MIR emission. Conversely, $\sim$58% of WISE AGN are undetected by X-rays, though we do not find that they are preferentially redder than the X-ray detected WISE AGN.
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