中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
Magnetic-reconnection-heated corona in active galactic nuclei: refined disc-corona model and application to broad-band radiation

文献类型:期刊论文

作者Cheng, Huaqing1,2; Liu, B. F.1,2; Liu JY(刘杰英)3,4,5; Liu, Zhu1; Qiao, Erlin1,2; Yuan, Weimin1,2
刊名MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期2020-06-01
卷号495期号:1页码:1158-1171
ISSN号0035-8711
关键词accretion, accretion discs magnetic fields galaxies: active galaxies: nuclei
DOI10.1093/mnras/staa1250
产权排序第3完成单位
文献子类Article
英文摘要

A 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.

学科主题天文学 ; 天体物理学 ; 高能天体物理学 ; 星系与宇宙学
URL标识查看原文
出版地GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND
WOS关键词X-RAY-SPECTRA ; ADVECTION-DOMINATED ACCRETION ; SEYFERT-GALAXIES ; BLACK-HOLES ; EMISSION ; ULTRAVIOLET ; TEMPERATURE ; REFLECTION ; TRANSITION ; VISCOSITY
资助项目National 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
WOS研究方向Astronomy & Astrophysics
语种英语
出版者OXFORD UNIV PRESS
WOS记录号WOS:000539101400087
资助机构National Program on Key Research and Development Project[2016YFA0400804] ; National Natural Science Foundation of China[11673026, 11803047, 11773037] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB23040100] ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences[XDA15310300, XDA15052100] ; National Aeronautics and Space Administration
源URL[http://ir.ynao.ac.cn/handle/114a53/23399]  
专题云南天文台_恒星物理研究组
云南天文台_中国科学院天体结构与演化重点实验室
通讯作者Cheng, Huaqing; Liu, B. F.
作者单位1.Key Laboratory of Space Astronomy and Technology, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, P. R. China
2.School of Astronomy and Space Sciences, University of Chinese Academy of Sciences, Beijing 100049, P. R. China
3.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011, P. R. China
4.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, P. R. China
5.Center for Astronomical Mega-Science, Chinese Academy of Sciences, Beijing 100012, P. R. China
推荐引用方式
GB/T 7714
Cheng, Huaqing,Liu, B. F.,Liu JY,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 JY,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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来源:云南天文台

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