SDSS-IV eBOSS Spectroscopy of X-Ray and WISE AGNs in Stripe 82X: Overview of the Demographics of X-Ray- and Mid-infrared-selected Active Galactic Nuclei
SDSS-IV eBOSS Spectroscopy of X-Ray and WISE AGNs in Stripe 82X: Overview of the Demographics of X-Ray- and Mid-infrared-selected Active Galactic Nuclei
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DOI：
10.3847/1538-4357/ab108b
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发表时间：
2019-02
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通讯作者：
S. LaMassa;A. Georgakakis;M. Vivek;M. Salvato;T. Ananna;C. M. Urry;C. MacLeod;N. Ross
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作者：
S. LaMassa;A. Georgakakis;M. Vivek;M. Salvato;T. Ananna;C. M. Urry;C. MacLeod;N. Ross
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宽视场红外巡天探测器（WISE）活动星系核（AGN）的候选人在36.8 deg2的条纹82区域。大约一半的调查（15.6 deg2）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。我们结合联合收割机这个样品与X射线和智慧活动星系核在外地确定通过其他来源的光谱，产生一个目录的4847来源，是82%的完成r 22。根据X射线光度或WISE颜色，这些源中有4730个是活动星系核，其平均红移为z 1。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，50%的WISE活动星系核在z 1044 erg s−1），这表明中红外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，其中活动星系核加热的尘埃并没有主导中红外发射。相反地，大约58%的WISE活动星系核没有被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活动星系核更红。
We report the results of a Sloan Digital Sky Survey IV eBOSS program to target X-ray sources and mid-infrared-selected Wide-field Infrared Survey Explorer (WISE) active galactic nucleus (AGN) candidates in a 36.8 deg2 region of Stripe 82. About half this survey (15.6 deg2) 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 AGNs in the field identified via other sources of spectroscopy, producing a catalog of 4847 sources that is 82% complete to r ∼ 22. Based on X-ray luminosities or WISE colors, 4730 of these sources are AGNs, with a median sample redshift of z ∼ 1. About 30% of the AGNs are optically obscured (i.e., lack broad lines in their optical spectra). BPT analysis, however, indicates that 50% of the WISE AGNs at z 1044 erg s−1), indicating that mid-infrared selection misses a sizable fraction of the highest luminosity AGNs, as well as lower luminosity sources where AGN-heated dust is not dominating the mid-infrared emission. Conversely, ∼58% of WISE AGNs are undetected by X-rays, though we do not find that they are preferentially redder than the X-ray-detected WISE AGNs.