NAOC Open IR  > 星系宇宙学研究部
X-Ray Eclipses of Active Galactic Nuclei
Zhang, Fupeng1,2; Yu, Qingjuan1; Lu, Youjun3,4
2017-08-10
Source PublicationASTROPHYSICAL JOURNAL
Volume845Issue:1
AbstractX-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.
SubtypeArticle
KeywordGalaxies: Active Galaxies: Seyfert Quasars: General Quasars: Supermassive Black Holes X-rays: Galaxies
WOS HeadingsScience & Technology ; Physical Sciences
Funding OrganizationNational 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)
DOI10.3847/1538-4357/aa7fbd
WOS KeywordBROAD-LINE REGION ; BLACK-HOLE MASS ; HIGH-RESOLUTION SPECTROSCOPY ; ABSORBING COLUMN DENSITIES ; SEYFERT-1 GALAXIES ; VARIABILITY AMPLITUDE ; REVERBERATION MEASUREMENTS ; ABSORPTION VARIABILITY ; SPECTRAL VARIABILITY ; TIME VARIABILITY
Indexed BySCI
Language英语
Funding OrganizationNational 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)
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000407627500013
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/20131
Collection星系宇宙学研究部
Affiliation1.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China
2.Sun Yat Sen Univ, Sch Phys & Astron, Guangzhou 510275, Guangdong, Peoples R China
3.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
4.Univ Chinese Acad Sci, Sch Astron & Space Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Fupeng,Yu, Qingjuan,Lu, Youjun. X-Ray Eclipses of Active Galactic Nuclei[J]. ASTROPHYSICAL JOURNAL,2017,845(1).
APA Zhang, Fupeng,Yu, Qingjuan,&Lu, Youjun.(2017).X-Ray Eclipses of Active Galactic Nuclei.ASTROPHYSICAL JOURNAL,845(1).
MLA Zhang, Fupeng,et al."X-Ray Eclipses of Active Galactic Nuclei".ASTROPHYSICAL JOURNAL 845.1(2017).
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