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REVISITING THE STRUCTURE AND SPECTRUM OF THE MAGNETIC-RECONNECTION- HEATED CORONA IN LUMINOUS AGNs
Liu JY(刘杰英)1,2; Qiao, E. L.3; Liu, B. F.3; Liu, JY (reprint atuhor), Chinese Acad Sci, Yunnan Observ, Natl Astron Observat, Kunming 650011, Peoples R China
发表期刊ASTROPHYSICAL JOURNAL
2016-12-10
卷号833期号:1
DOI10.3847/1538-4357/833/1/35
产权排序第1完成单位
收录类别SCI
关键词Galaxies: Active X-rays: Galaxies Accretion Accretion Disks
摘要It is believed that the hard X-ray emission in the luminous active galactic nuclei (AGNs) is from the hot corona above the cool accretion disk. However, the formation of the corona is still debated. Liu et al. investigated the spectrum of the corona heated by the reconnection of the magnetic field generated by dynamo action in the thin disk and emerging into the corona as a result of buoyancy instability. In the present paper, we improve this model to interpret the observed relation of the hard X-ray spectrum becoming softer at higher accretion rate in luminous AGNs. The magnetic field is characterized by beta(0), i.e., the ratio of the sum of gas pressure and radiation pressure to the magnetic pressure in the disk (beta(0)=(P-g,P- d+ P-r,P-d)/PB). Besides, both the intrinsic disk photons and reprocessed photons by the disk are included as the seed photons for inverse Compton scattering. These improvements are crucial for investigating the effect of magnetic field on the accretion disk corona when it is not clear whether the radiation pressure or gas pressure dominates in the thin disk. We change the value of beta(0) in order to constrain the magnetic field in the accretion disk in luminous AGNs. We find that the energy fraction released in the corona (f) gradually increases with the decrease of beta(0) for the same accretion rate. When beta(0) decreases to less than 50, the structure and spectrum of the disk corona are independent of accretion rate, which is similar to the hard spectrum found in Liu et al. Comparing with the observational results of the hard X-ray bolometric correction factor in a sample of luminous AGNs, we suggest that the value of beta(0) is about 100-200 for alpha = 0.3, and the energy fraction f should be larger than 30% for hard X-ray emission.
项目资助者National Natural Science Foundation of China(11303046, 11303086, 11673026, U1231203) ; Strategic Priority Research Program "The Emergence of Cosmological Structures" of the Chinese Academy of Sciences(XDB09000000) ; Gravitational Wave Pilot B(XDB23040100) ; National Program on Key Research and Development Project(2016YFA0400804)
语种英语
学科领域天文学
文章类型Article
ISSN0004-637X
URL查看原文
归档日期2017-03-22
WOS记录号WOS:000390556900008
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]ACTIVE GALACTIC NUCLEI ; X-RAY BINARIES ; ADVECTION-DOMINATED ACCRETION ; BIG BLUE BUMP ; BLACK-HOLES ; DISK EVAPORATION ; PHOTON INDEX ; ENERGY-DISTRIBUTIONS ; SEYFERT-GALAXIES ; EDDINGTON RATIO
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被引频次:2[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/9873
专题恒星物理研究组
中国科学院天体结构与演化重点实验室
通讯作者Liu, JY (reprint atuhor), Chinese Acad Sci, Yunnan Observ, Natl Astron Observat, Kunming 650011, Peoples R China
作者单位1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011, China
2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, China
3.National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
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Liu JY,Qiao, E. L.,Liu, B. F.,et al. REVISITING THE STRUCTURE AND SPECTRUM OF THE MAGNETIC-RECONNECTION- HEATED CORONA IN LUMINOUS AGNs[J]. ASTROPHYSICAL JOURNAL,2016,833(1).
APA Liu JY,Qiao, E. L.,Liu, B. F.,&Liu, JY .(2016).REVISITING THE STRUCTURE AND SPECTRUM OF THE MAGNETIC-RECONNECTION- HEATED CORONA IN LUMINOUS AGNs.ASTROPHYSICAL JOURNAL,833(1).
MLA Liu JY,et al."REVISITING THE STRUCTURE AND SPECTRUM OF THE MAGNETIC-RECONNECTION- HEATED CORONA IN LUMINOUS AGNs".ASTROPHYSICAL JOURNAL 833.1(2016).
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