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The condensation of the corona for the correlation between the hard X-ray photon index Gamma and the reflection scaling factor R in active galactic nuclei
Qiao, Erlin1,2; Liu, B. F.1,2
2017-05-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume467Issue:1Pages:898-905
AbstractObservationally, it is found that there is a strong correlation between the hard X-ray photon index Gamma and the Compton reflection scaling factor R in active galactic nuclei. In this paper, we propose that the Gamma -R correlation can be explained within the framework of the condensation of the hot corona on to the cold accretion disc around a supermassive black hole. In the model, it is presumed that, initially, a vertically extended hot gas (corona) is supplied to the central supermassive black hole by capturing the interstellarmedium and stellar wind. In this scenario, when the initial mass accretion rate. M/M-Edd greater than or similar to 0.01, at a critical radius r(d), part of the hot gas begins to condense on to the equatorial disc plane of the black hole, forming an inner cold accretion disc. Then, the matter is accreted in the form of a disc-corona structure extending down to the innermost stable circular orbits of the black hole. The size of the inner disc is determined by the initial mass accretion rate. With the increase of the initial mass accretion rate, the size of the inner disc increases, which results in both the increase of the Compton reflection scaling factor Gamma and the increase of the hard X-ray photon index Gamma. By comparing with a sample of Seyfert galaxies with well-fitted X-ray spectra, it is found that our model can roughly explain the observations. Finally, we discuss the possibility of applying our model to high-mass X-ray binaries, which are believed to be fuelled by hot winds from the companion stars.
SubtypeArticle
KeywordBlack Hole Physics Accretion Galaxies: Active Accretion Discs
WOS HeadingsScience & Technology ; Physical Sciences
Funding OrganizationNational Natural Science Foundation of China(11303046 ; National Natural Science Foundation of China(11303046 ; gravitational wave pilot B(XDB23040100) ; gravitational wave pilot B(XDB23040100) ; National Program on Key Research and Development Project(2016YFA0400804) ; National Program on Key Research and Development Project(2016YFA0400804) ; 11673026) ; 11673026) ; National Natural Science Foundation of China(11303046 ; National Natural Science Foundation of China(11303046 ; gravitational wave pilot B(XDB23040100) ; gravitational wave pilot B(XDB23040100) ; National Program on Key Research and Development Project(2016YFA0400804) ; National Program on Key Research and Development Project(2016YFA0400804) ; 11673026) ; 11673026)
DOI10.1093/mnras/stx121
WOS KeywordACCRETING BLACK-HOLES ; ADVECTION-DOMINATED ACCRETION ; BROAD-BAND SPECTRA ; BIG BLUE BUMP ; SEYFERT-GALAXIES ; XMM-NEWTON ; COMPTON REFLECTION ; LOW/HARD STATE ; CYGNUS X-1 ; GX 339-4
Indexed BySCI
Language英语
Funding OrganizationNational Natural Science Foundation of China(11303046 ; National Natural Science Foundation of China(11303046 ; gravitational wave pilot B(XDB23040100) ; gravitational wave pilot B(XDB23040100) ; National Program on Key Research and Development Project(2016YFA0400804) ; National Program on Key Research and Development Project(2016YFA0400804) ; 11673026) ; 11673026) ; National Natural Science Foundation of China(11303046 ; National Natural Science Foundation of China(11303046 ; gravitational wave pilot B(XDB23040100) ; gravitational wave pilot B(XDB23040100) ; National Program on Key Research and Development Project(2016YFA0400804) ; National Program on Key Research and Development Project(2016YFA0400804) ; 11673026) ; 11673026)
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000398418900061
Citation statistics
Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/8220
Collection空间科学研究部
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Key Lab Space Astron & Technol, Beijing 100012, Peoples R China
2.Univ Chinese Acad Sci, Sch Astron & Space Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Qiao, Erlin,Liu, B. F.. The condensation of the corona for the correlation between the hard X-ray photon index Gamma and the reflection scaling factor R in active galactic nuclei[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2017,467(1):898-905.
APA Qiao, Erlin,&Liu, B. F..(2017).The condensation of the corona for the correlation between the hard X-ray photon index Gamma and the reflection scaling factor R in active galactic nuclei.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,467(1),898-905.
MLA Qiao, Erlin,et al."The condensation of the corona for the correlation between the hard X-ray photon index Gamma and the reflection scaling factor R in active galactic nuclei".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 467.1(2017):898-905.
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