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Interaction of the accretion flows in corona and disk near the black hole in active galactic nuclei
Meyer-Hofmeister, E.1; Liu, B. F.2,3; Qiao, E.2,3
2017-11-20
Source PublicationASTRONOMY & ASTROPHYSICS
ISSN1432-0746
Volume607Pages:7
AbstractContext. Accretion flows toward black holes can be of a quite different nature, described as an optically thick cool gas flow in a disk for high accretion rates or as a hot coronal optically thin gas flow for low accretion rates, possibly affected by outflowing gas. Aims. The detection of broad iron emission lines in active galactic nuclei (AGN) indicates the coexistence of corona and disk. The appearance and relative strength of such flows essentially depends on their interaction. Liu et al. suggested that condensation of gas from the corona to the disk allows to understand accretion flows of comparable strength of emission. Matter inflow due to gravitational capture of gas is important for the condensation process. We discuss observational features predicted by the model. Methods. Data from simultaneous observations of AGN with Swift's X-ray and UV-optical telescopes are compared with the theoretical predictions. Results. The frequent detection of broad iron K-alpha emission lines and the dependence of the emitted spectra on the Eddington ratio, described by the values of the photon index and the two-point spectral index alpha(ox) are in approximate agreement with the predictions of the condensation model; the latter, however, with a large scatter. The model further yields a coronal emission concentrated in a narrow inner region as is also deduced from the analysis of emissivity profiles. Conclusions. The accretion flows in bright AGN could be described by the accretion of stellar wind or interstellar medium and its condensation into a thin disk.
Keywordaccretion, accretion disks X-rays: binaries X-rays: galaxies galaxies: Seyfert quasars: individual: Mrk 335
Funding OrganizationNational Program on Key Research and Development Project ; National Program on Key Research and Development Project ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Program on Key Research and Development Project ; National Program on Key Research and Development Project ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Program on Key Research and Development Project ; National Program on Key Research and Development Project ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Program on Key Research and Development Project ; National Program on Key Research and Development Project ; National Natural Science Foundation of China ; National Natural Science Foundation of China
DOI10.1051/0004-6361/201731105
WOS KeywordADVECTION-DOMINATED ACCRETION ; X-RAY-SPECTRA ; RECONNECTION-HEATED CORONA ; INNER COOL DISKS ; BROAD IRON LINES ; LOW-HARD STATE ; SEYFERT-GALAXIES ; 1H 0707-495 ; EXTREME VARIABILITY ; MRK 335
Language英语
Funding ProjectNational Program on Key Research and Development Project[2016YFA0400804] ; National Natural Science Foundation of China[11673026]
Funding OrganizationNational Program on Key Research and Development Project ; National Program on Key Research and Development Project ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Program on Key Research and Development Project ; National Program on Key Research and Development Project ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Program on Key Research and Development Project ; National Program on Key Research and Development Project ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Program on Key Research and Development Project ; National Program on Key Research and Development Project ; National Natural Science Foundation of China ; National Natural Science Foundation of China
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000415859600003
PublisherEDP SCIENCES S A
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/37327
Collection中国科学院国家天文台
Corresponding AuthorMeyer-Hofmeister, E.
Affiliation1.Max Planck Inst Astrophys, Karl Schwarzschildstr 1, D-85740 Garching, Germany
2.Chinese Acad Sci, Natl Astron Observ, Key Lab Space Astron & Technol, Beijing 100012, Peoples R China
3.Univ Chinese Acad Sci, Sch Astron & Space Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Meyer-Hofmeister, E.,Liu, B. F.,Qiao, E.. Interaction of the accretion flows in corona and disk near the black hole in active galactic nuclei[J]. ASTRONOMY & ASTROPHYSICS,2017,607:7.
APA Meyer-Hofmeister, E.,Liu, B. F.,&Qiao, E..(2017).Interaction of the accretion flows in corona and disk near the black hole in active galactic nuclei.ASTRONOMY & ASTROPHYSICS,607,7.
MLA Meyer-Hofmeister, E.,et al."Interaction of the accretion flows in corona and disk near the black hole in active galactic nuclei".ASTRONOMY & ASTROPHYSICS 607(2017):7.
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