BASS XXV：DR2基于宽线的黑洞质量估计和遮蔽偏差
BASS XXV: DR2 Broad-line Based Black Hole Mass Estimates and Biases from Obscuration
摘要：
作为BAT活动星系核光谱巡天（BASS/DR 2）第二次数据发布的一部分，我们对大样本超硬X射线选择的活动星系核（AGN）的宽发射线和超大质量黑洞质量（$M_{BH}$）的维里估计进行了测量。我们的目录包括$M_{BH}$对总共689个活动星系核的估计，这些活动星系核是由H $α$、H $β$、$MgII\lambda2798$和/或$CIV\lambda1549$宽发射线确定的。核心样本包括从70个月的Swift/BAT全天空目录中提取的总共512个活动星系核。我们还提供了177个额外的活动星系核的测量，从更深的斯威夫特/BAT调查数据。我们研究$M_{BH}$估计和X射线光谱分析测量的视线遮蔽之间的联系。我们发现，相对于超硬X射线发射，遮蔽活动星系核（$\log (N_{\rm H}/{\rm cm}^{-2})> 22.0$）中的宽H $α$发射线平均弱$8.0_{-2.4}^{+4.1}$倍，并且比未遮蔽源中的$35_{-12}^{~+7}$窄约1%（即，$\log (N_{\rm H}/{\rm cm}^{-2}) < 21.5$）。这表明宽线区域的最内部部分被优先吸收。因此，目前的单历元$M_{BH}$处方导致1.9型源（具有宽H $α$但没有宽H $β$的活动星系核）和/或具有$\log (N_{\rm H}/{\rm cm}^{-2}) > 22.0$的源的质量被严重低估（$>$ 1 dex）。我们提供了简单的乘法修正观测到的亮度和宽度的广泛H $α$组件（$L[{\rm b}{\rm H}α]$和FWHM[bH $α$ ]）在这样的来源，以考虑这种影响，并（部分）补救$M_{BH}$估计类型1.9对象。作为BASS/DR 2的关键组成部分，我们的工作为社区提供了进一步研究低红移宇宙中强大AGN所需的数据。
英文摘要：
We present measurements of broad emission lines and virial estimates of supermassive black hole masses ($M_{BH}$) for a large sample of ultra-hard X-ray selected active galactic nuclei (AGNs) as part of the second data release of the BAT AGN Spectroscopic Survey (BASS/DR2). Our catalog includes $M_{BH}$ estimates for a total 689 AGNs, determined from the H$α$, H$β$, $MgII\lambda2798$, and/or $CIV\lambda1549$ broad emission lines. The core sample includes a total of 512 AGNs drawn from the 70-month Swift/BAT all-sky catalog. We also provide measurements for 177 additional AGNs that are drawn from deeper Swift/BAT survey data. We study the links between $M_{BH}$ estimates and line-of-sight obscuration measured from X-ray spectral analysis. We find that broad H$α$ emission lines in obscured AGNs ($\log (N_{\rm H}/{\rm cm}^{-2})> 22.0$) are on average a factor of $8.0_{-2.4}^{+4.1}$ weaker, relative to ultra-hard X-ray emission, and about $35_{-12}^{~+7}$\% narrower than in unobscured sources (i.e., $\log (N_{\rm H}/{\rm cm}^{-2}) < 21.5$). This indicates that the innermost part of the broad-line region is preferentially absorbed. Consequently, current single-epoch $M_{BH}$ prescriptions result in severely underestimated ($>$1 dex) masses for Type 1.9 sources (AGNs with broad H$α$ but no broad H$β$) and/or sources with $\log (N_{\rm H}/{\rm cm}^{-2}) > 22.0$. We provide simple multiplicative corrections for the observed luminosity and width of the broad H$α$ component ($L[{\rm b}{\rm H}α]$ and FWHM[bH$α$]) in such sources to account for this effect, and to (partially) remedy $M_{BH}$ estimates for Type 1.9 objects. As key ingredient of BASS/DR2, our work provides the community with the data needed to further study powerful AGNs in the low-redshift Universe.
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