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REVISITING THE STRUCTURE AND SPECTRUM OF THE MAGNETIC-RECONNECTION-HEATED CORONA IN LUMINOUS AGNs
Liu,J. Y.1,2; Qiao,E. L.3; Liu,B. F.3
2016-12-06
Source PublicationThe Astrophysical Journal
ISSN0004-637X
Volume833Issue:1
AbstractABSTRACT 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 , i.e., the ratio of the sum of gas pressure and radiation pressure to the magnetic pressure in the disk ( ). 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 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 for the same accretion rate. When 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 is about 100–200 for α?=?0.3, and the energy fraction f should be larger than 30% for hard X-ray emission.
Keywordaccretion, accretion disks galaxies: active X-rays: galaxies
DOI10.3847/1538-4357/833/1/35
Language英语
WOS IDIOP:0004-637X-833-1-35
PublisherThe American Astronomical Society
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Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/36213
Collection中国科学院国家天文台
Affiliation1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011, China; ljy0807@ynao.ac.cn
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; qiaoel@nao.cas.cn, bfliu@nao.cas.cn
Recommended Citation
GB/T 7714
Liu,J. Y.,Qiao,E. L.,Liu,B. F.. REVISITING THE STRUCTURE AND SPECTRUM OF THE MAGNETIC-RECONNECTION-HEATED CORONA IN LUMINOUS AGNs[J]. The Astrophysical Journal,2016,833(1).
APA Liu,J. Y.,Qiao,E. L.,&Liu,B. F..(2016).REVISITING THE STRUCTURE AND SPECTRUM OF THE MAGNETIC-RECONNECTION-HEATED CORONA IN LUMINOUS AGNs.The Astrophysical Journal,833(1).
MLA Liu,J. Y.,et al."REVISITING THE STRUCTURE AND SPECTRUM OF THE MAGNETIC-RECONNECTION-HEATED CORONA IN LUMINOUS AGNs".The Astrophysical Journal 833.1(2016).
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