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X-Ray Eclipses of Active Galactic Nuclei

文献类型：期刊论文

作者Yu, Qingjuan1; Lu, Youjun2,3; Zhang, Fupeng1,4; Lu,Youjun
刊名ASTROPHYSICAL JOURNAL
出版日期2017-08-10
卷号845期号:1
关键词Galaxies: Active Galaxies: Seyfert Quasars: General Quasars: Supermassive Black Holes X-rays: Galaxies
DOI10.3847/1538-4357/aa7fbd
文献子类Article
英文摘要X-ray variation is a ubiquitous feature of active galactic nuclei (AGNs); however, its origin is not well understood. In this paper, we show that the X-ray flux variations in some AGNs, and correspondingly, the power spectral densities (PSDs) of the variations, may be interpreted as being caused by absorptions of eclipsing clouds or clumps in the broad-line region (BLR) and the dusty torus. By performing Monte Carlo simulations for a number of plausible cloud models, we systematically investigate the statistics of the X-ray variations resulting from the cloud eclipsing and the PSDs of the variations. For these models, we show that the number of eclipsing events can be significant and the absorption column densities due to those eclipsing clouds can be in the range from 1021 to 1024 cm(-2), leading to significant X-ray variations. We find that the PSDs obtained from the mock observations for the X-ray flux and the absorption column density resulting from these models can be described by a broken double power law, similar to those directly measured from observations of some AGNs. The shape of the PSDs depend strongly on the kinematic structures and the intrinsic properties of the clouds in AGNs. We demonstrate that the X-ray eclipsing model can naturally lead to a strong correlation between the break frequencies (and correspondingly the break timescales) of the PSDs and the masses of the massive black holes (MBHs) in the model AGNs, which can be well consistent with the one obtained from observations. Future studies of the PSDs of the AGN X-ray (and possibly also the optical-UV) flux and column density variations may provide a powerful tool to constrain the structure of the BLR and the torus and to estimate the MBH masses in AGNs.
WOS关键词BROAD-LINE REGION ; BLACK-HOLE MASS ; HIGH-RESOLUTION SPECTROSCOPY ; ABSORBING COLUMN DENSITIES ; SEYFERT-1 GALAXIES ; VARIABILITY AMPLITUDE ; REVERBERATION MEASUREMENTS ; ABSORPTION VARIABILITY ; SPECTRAL VARIABILITY ; TIME VARIABILITY
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:000407627500013
资助机构National Natural Science Foundation of China(11373031 ; National Natural Science Foundation of China(11373031 ; National Key Program for Science and Technology Research and Development(2016YFA0400703 ; National Key Program for Science and Technology Research and Development(2016YFA0400703 ; Chinese Academy of Sciences(XDB 23040100) ; Chinese Academy of Sciences(XDB 23040100) ; Fundamental Research Funds for the Central Universities(161GPY51) ; Fundamental Research Funds for the Central Universities(161GPY51) ; postdoctoral fund(2014M550549) ; postdoctoral fund(2014M550549) ; 11390372 ; 11390372 ; 2016YFA0400704) ; 2016YFA0400704) ; 11273004 ; 11273004 ; 11603083) ; 11603083) ; National Natural Science Foundation of China(11373031 ; National Natural Science Foundation of China(11373031 ; National Key Program for Science and Technology Research and Development(2016YFA0400703 ; National Key Program for Science and Technology Research and Development(2016YFA0400703 ; Chinese Academy of Sciences(XDB 23040100) ; Chinese Academy of Sciences(XDB 23040100) ; Fundamental Research Funds for the Central Universities(161GPY51) ; Fundamental Research Funds for the Central Universities(161GPY51) ; postdoctoral fund(2014M550549) ; postdoctoral fund(2014M550549) ; 11390372 ; 11390372 ; 2016YFA0400704) ; 2016YFA0400704) ; 11273004 ; 11273004 ; 11603083) ; 11603083)
源URL[http://ir.bao.ac.cn/handle/114a11/20131]  
专题国家天文台_星系宇宙学研究部
作者单位1.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China
2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
3.Univ Chinese Acad Sci, Sch Astron & Space Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China
4.Sun Yat Sen Univ, Sch Phys & Astron, Guangzhou 510275, Guangdong, Peoples R China
推荐引用方式
GB/T 7714		 Yu, Qingjuan,Lu, Youjun,Zhang, Fupeng,et al. X-Ray Eclipses of Active Galactic Nuclei[J]. ASTROPHYSICAL JOURNAL,2017,845(1).
APA Yu, Qingjuan,Lu, Youjun,Zhang, Fupeng,&Lu,Youjun.(2017).X-Ray Eclipses of Active Galactic Nuclei.ASTROPHYSICAL JOURNAL,845(1).
MLA Yu, Qingjuan,et al."X-Ray Eclipses of Active Galactic Nuclei".ASTROPHYSICAL JOURNAL 845.1(2017).

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来源：国家天文台

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