BAT AGN Spectroscopic Survey XXVII: scattered X-Ray radiation in obscured active galactic nuclei
BAT AGN Spectroscopic Survey XXVII: scattered X-Ray radiation in obscured active galactic nuclei
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DOI：
10.1093/mnras/stab839
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发表时间：
2021-03
影响因子：
4.8
通讯作者：
K. K. Gupta-K.;C. Ricci;A. Tortosa;Y. Ueda;T. Kawamuro;M. Koss;B. Trakhtenbrot;K. Oh;F. Bauer;F. Ricci;G. Privon;L. Zappacosta;D. Stern;D. Kakkad;E. Piconcelli;S. Veilleux;R. Mushotzky;T. Caglar;K. Ichikawa;A. Elagali;M. Powell;C. Urry;F. Harrison
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文献类型：
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作者：
K. K. Gupta-K.;C. Ricci;A. Tortosa;Y. Ueda;T. Kawamuro;M. Koss;B. Trakhtenbrot;K. Oh;F. Bauer;F. Ricci;G. Privon;L. Zappacosta;D. Stern;D. Kakkad;E. Piconcelli;S. Veilleux;R. Mushotzky;T. Caglar;K. Ichikawa;A. Elagali;M. Powell;C. Urry;F. Harrison
吸积超大质量黑洞（SMBH），也被称为活动星系核（AGN），通常被大量的气体和尘埃包围。这种周围的物质重新处理了SMBH附近产生的初级X射线辐射，并在AGN的宽带X射线光谱中产生了几个成分，包括可能与汤姆孙散射辐射有关的幂律。在这项工作中，我们研究了386个硬X射线选择的样本，附近（$z\sim0.03$）遮蔽活动星系核从70个月的斯威夫特/BAT目录的散射组件的属性。我们研究了如何与AGN的不同物理性质，如视线柱密度，X射线光度，黑洞质量和爱丁顿比的汤姆逊散射辐射的分数。我们发现散射分数和柱密度之间存在显着的负相关性。基于大量的光谱模拟，我们排除了这种关系是由于参数之间的简并的可能性。当考虑不同的光度范围，黑洞质量和爱丁顿比时，负相关性也仍然存在。我们讨论如何这种相关性可能是由于角度依赖的汤姆逊截面或更模糊的来源具有较高的覆盖因子的环面。我们还发现散射分数与[Oiii] λ5007与X射线光度的比值之间存在正相关关系。这一结果与以前的研究结果一致，并表明埃里克森散射分量与窄线区域有关。
Accreting supermassive black holes (SMBHs), also known as active galactic nuclei (AGN), are generally surrounded by large amounts of gas and dust. This surrounding material reprocesses the primary X-ray emission produced close to the SMBH and gives rise to several components in the broadband X-ray spectra of AGN, including a power-law possibly associated with Thomson-scattered radiation. In this work, we study the properties of this scattered component for a sample of 386 hard-X-ray-selected, nearby ($z\sim0.03$) obscured AGN from the 70-month Swift/BAT catalogue. We investigate how the fraction of Thomson-scattered radiation correlates with different physical properties of AGN, such as line-of-sight column density, X-ray luminosity, black hole mass, and Eddington ratio. We find a significant negative correlation between the scattering fraction and the column density. Based on a large number of spectral simulations, we exclude the possibility that this anticorrelation is due to degeneracies between the parameters. The negative correlation also persists when considering different ranges of luminosity, black hole mass, and Eddington ratio. We discuss how this correlation might be either due to the angle dependence of the Thomson cross-section or to more obscured sources having a higher covering factor of the torus. We also find a positive correlation between the scattering fraction and the ratio of [O iii] λ5007 to X-ray luminosity. This result is consistent with previous studies and suggests that the Thomson-scattered component is associated with the narrow-line region.