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arXiv 2407.12904astro-ph.HEastro-ph.GA
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利用 XMM-Newton 研究高质量吸积活动星系核的核区性质

Investigating the nuclear properties of highly accreting active galactic nuclei with XMM-Newton

M. Laurenti, F. Tombesi, F. Vagnetti, E. Piconcelli, M. Guainazzi, C. Vignali, M. Paolillo, R. Middei, A. Bongiorno, L. Zappacosta

AI总结:

本研究构建了包含61个高质量吸积AGN的X-HESS样本,分析其X射线光谱与光变性质,发现其光子指数与爱丁顿比关系存在离散性,并在低爱丁顿比、低黑洞质量样本中更为显著。

摘要:

我们对高质量吸积活动星系核(AGN)的理解受到两方面因素的阻碍:一是缺乏对其主要光谱和光变性质完整而系统的调查,二是它们在局部宇宙中相对匮乏,特别是那些由 $M_\mathrm{BH} > 10^8\,M_\odot$ 的超大质量黑洞驱动的活动星系核。为了克服这一局限性,我们在此展示了一个包含61个高质量吸积AGN的大型新样本的X射线光谱分析结果,该样本被命名为 XMM-Newton High-Eddington Serendipitous AGN Sample(或 X-HESS),它是通过将第11版 XMM-Newton 偶现星表与 SDSS DR14 类星体光谱性质星表进行交叉相关分析获得的。X-HESS AGN 分布在很宽的区间内,其红移为 $0.06<z<3.3$,黑洞质量为 $6.8<\log(M_\mathrm{BH}/M_\odot)<9.8$,热辐射光度为 $44.7<\log(L_\mathrm{bol}/\mathrm{erg\\,s}^{-1})<48.3$,爱丁顿比为 $-0.2<\logλ_\mathrm{Edd}<0.5$。这些AGN中有超过三分之一具有不同历元的多次观测数据,使我们能够研究它们的光变性。我们在高质量吸积的 X-HESS AGN 的 $Γ- λ_\mathrm{Edd}$ 分布中发现了巨大的离散性。只有在考虑 $λ_\mathrm{Edd}\lesssim0.3$ 的低爱丁顿比 AGN 样本时,才发现显著的相关性。对于具有较低 $M_\mathrm{BH}$ 和/或 $L_\mathrm{bol}$ 的 AGN,$Γ- λ_\mathrm{Edd}$ 关系在统计上显得更为可靠。我们探讨了通过利用光学监视器同时观测的光学/紫外数据计算爱丁顿比 $λ_\mathrm{Edd,O/UV}$,将 $Γ- λ_\mathrm{Edd}$ 平面转换为完全依赖于历元的坐标系的可能性。最后,我们还得到了关于 $Γ$ 与软X射线超额强度之间可能存在反相关性的微弱迹象。

英文摘要:

Our understanding of highly accreting AGNs is hampered by the lack of a complete systematic investigation in terms of their main spectral and variability properties, and by the relative paucity of them in the local Universe, especially those powered by supermassive black holes with $M_\mathrm{BH} > 10^8\,M_\odot$. To overcome this limitation, we present here the X-ray spectral analysis of a new, large sample of 61 highly accreting AGNs named as the \emph{XMM-Newton} High-Eddington Serendipitous AGN Sample, or X-HESS, obtained by cross-correlating the 11th release of the \emph{XMM-Newton} serendipitous catalogue and the catalogue of spectral properties of quasars from the SDSS DR14. The X-HESS AGNs are spread across wide intervals with a redshift of $0.06<z<3.3$, a black hole mass of $6.8<\log(M_\mathrm{BH}/M_\odot)<9.8$, a bolometric luminosity of $44.7<\log(L_\mathrm{bol}/\mathrm{erg\,s}^{-1})<48.3$, and an Eddington ratio of $-0.2<\logλ_\mathrm{Edd}<0.5$, and more than one third of these AGNs can rely on multiple observations at different epochs, allowing us to investigate also their variability. We find a large scatter in the $Γ- λ_\mathrm{Edd}$ distribution of the highly accreting X-HESS AGNs. A significant correlation is only found by considering a sample of lower-\ledd\ AGNs with $λ_\mathrm{Edd}\lesssim0.3$. The $Γ- λ_\mathrm{Edd}$ relation appears to be more statistically sound for AGNs with lower $M_\mathrm{BH}$ and/or $L_\mathrm{bol}$. We investigate the possibility of transforming the $Γ- λ_\mathrm{Edd}$ plane into a fully epoch-dependent frame by calculating the Eddington ratio from the simultaneous optical/UV data from the optical monitor, $λ_\mathrm{Edd,O/UV}$. Finally, we also get a mild indication of a possible anti-correlation between $Γ$ and the strength of the soft excess.

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