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Magnetic-reconnection-heated corona in active galactic nuclei: refined disc-corona model and application to broad-band radiation
Cheng, Huaqing1,2; Liu, B. F.1,2; Liu, Jieying3,4,5; Liu, Zhu1; Qiao, Erlin1,2; Yuan, Weimin1,2
2020-06-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume495Issue:1Pages:1158-1171
AbstractA long-standing question in active galactic nucleus (AGN) research is how the corona is heated up to produce X-ray radiation much stronger than that arising from the viscous heating within the corona. In this paper, we carry out detailed investigations of magnetic-reconnection heating to the corona, specifically, studying how the disc and corona are self-consistently coupled with the magnetic field, and how the emergent spectra depend on the fundamental parameters of AGN. It is shown that diverse spectral shapes and luminosities over a broad bandpass from optical to X-ray can be produced from the coupled disc and corona within a limited range of the black hole mass, accretion rate, and magnetic field strength. The relative strength of X-ray emission with respect to optical/ultraviolet (UV) depends on the strength of the magnetic field in the disc, which, together with accretion rate, determines the fraction of accretion energy transported and released in the corona. This refined disc-corona model is then applied to reproduce the broad-band spectral energy distributions (SEDs) of a sample of 20 bright local AGNs observed simultaneously in X-ray and optical/UV. We find that, in general, the overall observed broad-band SEDs can be reasonably reproduced, except for rather hard X-ray spectral shapes in some objects. The radiation pressure-dominant region, as previously predicted for the standard accretion disc in AGN, disappears for strong X-ray sources, revealing that AGN accretion discs are indeed commonly stable as observed. Our study suggests the disc-corona coupling model involving magnetic fields to be a promising approach for understanding the broad-band spectra of bright AGNs.
Keywordaccretion, accretion discs magnetic fields galaxies: active galaxies: nuclei
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 ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration ; 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 ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration ; 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 ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration ; 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 ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration
DOI10.1093/mnras/staa1250
WOS KeywordX-RAY-SPECTRA ; ADVECTION-DOMINATED ACCRETION ; SEYFERT-GALAXIES ; BLACK-HOLES ; EMISSION ; ULTRAVIOLET ; TEMPERATURE ; REFLECTION ; TRANSITION ; VISCOSITY
Language英语
Funding ProjectNational Program on Key Research and Development Project[2016YFA0400804] ; National Natural Science Foundation of China[11673026] ; National Natural Science Foundation of China[11803047] ; National Natural Science Foundation of China[11773037] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB23040100] ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences[XDA15310300] ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences[XDA15052100] ; National Aeronautics and Space Administration
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 ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration ; 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 ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration ; 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 ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration ; 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 ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000539101400087
PublisherOXFORD UNIV PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/83481
Collection中国科学院国家天文台
Corresponding AuthorCheng, Huaqing; Liu, B. F.
Affiliation1.Chinese Acad Sci, Key Lab Space Astron & Technol, Natl Astron Observ, Beijing 100012, Peoples R China
2.Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, Kunming 650011, Yunnan, Peoples R China
4.Chinese Acad Sci, Key Lab Struct & Evolut Celestial Objects, Kunming 650011, Yunnan, Peoples R China
5.Chinese Acad Sci, Ctr Astron Mega Sci, Beijing 100012, Peoples R China
Recommended Citation
GB/T 7714
Cheng, Huaqing,Liu, B. F.,Liu, Jieying,et al. Magnetic-reconnection-heated corona in active galactic nuclei: refined disc-corona model and application to broad-band radiation[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2020,495(1):1158-1171.
APA Cheng, Huaqing,Liu, B. F.,Liu, Jieying,Liu, Zhu,Qiao, Erlin,&Yuan, Weimin.(2020).Magnetic-reconnection-heated corona in active galactic nuclei: refined disc-corona model and application to broad-band radiation.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,495(1),1158-1171.
MLA Cheng, Huaqing,et al."Magnetic-reconnection-heated corona in active galactic nuclei: refined disc-corona model and application to broad-band radiation".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 495.1(2020):1158-1171.
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