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arXiv 2102.02832astro-ph.GAastro-ph.HE
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超、次爱丁顿吸积活动星系核的吸积盘-日冕联系观测差异

On the Observational Difference Between the Accretion Disk-Corona Connections among Super- and Sub-Eddington Accreting Active Galactic Nuclei

Hezhen Liu, B. Luo, W. N. Brandt, Michael S. Brotherton, S. C. Gallagher, Q. Ni, Ohad Shemmer, J. D. Timlin

摘要:

我们提出了一个系统的X射线和多波长的研究样本的47个活动星系核(AGN)的混响映射测量。该样本包括21个超爱丁顿吸积活动星系核和26个亚爱丁顿吸积活动星系核。使用高状态观测与同时X射线和UV/光学测量,我们调查是否super-Eddington吸积活动星系核表现出不同的吸积盘-日冕连接相比,sub-Eddington吸积活动星系核。我们发现X射线到紫外/光谱斜率参数($α_{\rm OX}$)和单色光度在$2500~Å$($L_{\rm 2500~Å}$)的超级和子爱丁顿子样本之间的紧密相关性。最佳拟合的$α_{\rm OX}-L_{\rm 2500~Å}$关系是一致的整体,表明超爱丁顿吸积活动星系核不是特别的X射线弱,一般相比,次爱丁顿吸积活动星系核。我们发现$α_{\rm OX}$的依赖性的爱丁顿比($L_{\rm Bol}/L_{\rm Edd}$)和黑洞质量($M_{\rm BH}$)参数为我们的全部样本。多变量线性回归分析产生$α_{\rm OX}=-0.13 {\rm log}(L_{\rm Bol}/L_{\rm Edd})-0.10 {\rm log}M_{\rm BH}-0.69$,其散点与$α_{\rm OX}-L_{\rm 2500~Å}$关系相似。硬(静止帧$>2\rm ~keV$)X射线光子指数($Γ$)是强相关的$L_{\rm Bol}/L_{\rm Edd}$的全样本和超爱丁顿子样本,但这两个参数不显着相关的子爱丁顿子样本。一小部分的超爱丁顿吸积活动星系核表现出强烈的X射线的变化,可能是由于小尺度的气体吸收,我们强调的重要性,采用高状态(本征)X射线辐射研究吸积盘日冕连接活动星系核。

英文摘要:

We present a systematic X-ray and multiwavelength study of a sample of 47 active galactic nuclei (AGNs) with reverberation-mapping measurements. This sample includes 21 super-Eddington accreting AGNs and 26 sub-Eddington accreting AGNs. Using high-state observations with simultaneous X-ray and UV/optical measurements, we investigate whether super-Eddington accreting AGNs exhibit different accretion disk-corona connections compared to sub-Eddington accreting AGNs. We find tight correlations between the X-ray-to-UV/optical spectral slope parameter ($α_{\rm OX}$) and the monochromatic luminosity at $2500~Å$ ($L_{\rm 2500~Å}$) for both the super- and sub-Eddington subsamples. The best-fit $α_{\rm OX}-L_{\rm 2500~Å}$ relations are consistent overall, indicating that super-Eddington accreting AGNs are not particularly X-ray weak in general compared to sub-Eddington accreting AGNs. We find dependences of $α_{\rm OX}$ on both the Eddington ratio ($L_{\rm Bol}/L_{\rm Edd}$) and black hole mass ($M_{\rm BH}$) parameters for our full sample. A multi-variate linear regression analysis yields $α_{\rm OX}=-0.13 {\rm log}(L_{\rm Bol}/L_{\rm Edd})-0.10 {\rm log}M_{\rm BH}-0.69$, with a scatter similar to that of the $α_{\rm OX}-L_{\rm 2500~Å}$ relation. The hard (rest-frame $>2\rm ~keV$) X-ray photon index ($Γ$) is strongly correlated with $L_{\rm Bol}/L_{\rm Edd}$ for the full sample and the super-Eddington subsample, but these two parameters are not significantly correlated for the sub-Eddington subsample. A fraction of super-Eddington accreting AGNs show strong X-ray variability, probably due to small-scale gas absorption, and we highlight the importance of employing high-state (intrinsic) X-ray radiation to study the accretion disk-corona connections in AGNs.

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