BASS XXX：DR2爱丁顿比、黑洞质量和X射线亮度的分布函数
BASS XXX: Distribution Functions of DR2 Eddington-ratios, Black Hole Masses, and X-ray Luminosities
摘要：
我们确定的低红移X射线光度函数（XLF），活动黑洞质量函数（BHMF），和爱丁顿比分布函数（ERDF）的未遮蔽（1型）和遮蔽（2型）活动星系核（AGN）使用前所未有的光谱完整性的BAT AGN光谱巡天（BASS）数据发布2。除了一个简单的1/Vmax的方法，我们还计算的内在分布，占样本截断采用前向建模的方法来恢复所观察到的BHMF和ERDF。由于之前的BHMF和ERDF仅针对明亮的宽线（1型）活动星系核和/或类星体的样本进行了稳健的确定，因此我们的BHMF和ERDF是第一个直接观测约束的2型活动星系核的BHMF和ERDF。我们发现，在考虑所有观测偏差后，2型活动星系核的内在ERDF比1型活动星系核的内在ERDF明显偏向于较低的爱丁顿比。这一结果支持辐射调节统一的情况下，辐射压力决定了周围的活动星系核的尘埃遮蔽结构的几何形状。在两个单独的质量箱中计算ERDF，我们验证了导出的形状是一致的，验证了ERDF（形状）是质量无关的假设。我们报告的本地活动星系核占空比作为质量和爱丁顿比的函数，通过比较BASS活动BHMF与本地质量函数的所有SMBH。我们还提出了日志N日志S的Swift-BAT 70个月的来源。
英文摘要：
We determine the low-redshift X-ray luminosity function (XLF), active black hole mass function (BHMF), and Eddington-ratio distribution function (ERDF) for both unobscured (Type 1) and obscured (Type 2) active galactic nuclei (AGN) using the unprecedented spectroscopic completeness of the BAT AGN Spectroscopic Survey (BASS) data release 2. In addition to a straightforward 1/Vmax approach, we also compute the intrinsic distributions, accounting for sample truncation by employing a forward modeling approach to recover the observed BHMF and ERDF. As previous BHMFs and ERDFs have been robustly determined only for samples of bright, broad-line (Type 1) AGNs and/or quasars, ours is the first directly observationally constrained BHMF and ERDF of Type 2 AGN. We find that after accounting for all observational biases, the intrinsic ERDF of Type 2 AGN is significantly skewed towards lower Eddington ratios than the intrinsic ERDF of Type 1 AGN. This result supports the radiation-regulated unification scenario, in which radiation pressure dictates the geometry of the dusty obscuring structure around an AGN. Calculating the ERDFs in two separate mass bins, we verify that the derived shape is consistent, validating the assumption that the ERDF (shape) is mass independent. We report the local AGN duty cycle as a function of mass and Eddington ratio, by comparing the BASS active BHMF with the local mass function for all SMBH. We also present the log N-log S of Swift-BAT 70-month sources.
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