Modelling accretion disc emission with generalized temperature profile and its effect on AGN spectral energy distribution

doi:10.1093/mnras/stz1532

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	Modelling accretion disc emission with generalized temperature profile and its effect on AGN spectral energy distribution
	Cheng, Huaqing 1,2; Yuan, Weimin 1,2; Liu, He-Yang 1,2; Breeveld, Alice. A.3; Jin, Chichuan 1; Liu, Bifang 1,2
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2019-08-01
卷号	487 期号:3 页码:3884-3903
关键词	accretion, accretion discs black hole physics galaxies: active galaxies: Seyfert
ISSN号	0035-8711
DOI	10.1093/mnras/stz1532
英文摘要	The broad-band spectral energy distribution (SED) of active galactic nuclei (AGNs) is investigated for a well-selected sample composed of 23 Seyfert 1 galaxies observed simultaneously in the optical/ultraviolet (UV) and X-ray bands with the Neil Gehrels Swift Observatory. The optical to UV continuum spectra are modelled, for the first time, with emission from an accretion disc with a generalized radial temperature profile, in order to account for the intrinsic spectra which are found to be generally redder than the model prediction of the standard Shakura-Sunyaev disc (SSD, F-nu proportional to nu(+1/3)). The power-law indices of the radial temperature profile (T-eff(R) proportional to R-P, R is the radius of the accretion disc) are inferred to be p = 0.5-0.75 (a median of 0.63), deviating from the canonical p = 0.75 for the SSD model as widely adopted in previous studies, A marginal correlation of a flatter radial temperature profile (a smaller p-value) with increasing the Eddington ratio is suggested. Such a model produces generally a lower peak of accretion disc emission and thus a smaller bolometric luminosity in some of the AGN, particularly those with high Eddington ratios, than that based On the SSD model by a factor of several. The broad-hand SED, the bolometric correction factors, and their dependence on some of the AGN parameters are revisited. We suggest that such non-standard SSD discs may operate in AGN and are at least partly responsible for the reddened optical/UV spectra as observed, One possible explanation for these flattened temperature profiles is the mass-loss process in form of disc winds/outflows,
资助项目	National Natural Science Foundation of China[11473035] ; National Natural Science Foundation of China[11673026] ; National Natural Science Foundation of China[11873054] ; National Natural Science Foundation of China[11803047] ; National Natural Science Foundation of China[11773037] ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences[XDA15052100] ; UK Space Agency ; Hundred Talents Program of the Chinese Academy of Sciences
WOS关键词	ACTIVE GALACTIC NUCLEI ; DIGITAL SKY SURVEY ; ADVECTION-DOMINATED ACCRETION ; X-RAY EXCESS ; RADIUS-LUMINOSITY RELATIONSHIP ; HOST-GALAXY STARLIGHT ; BLACK-HOLE MASSES ; BROAD-LINE REGION ; SEYFERT-GALAXIES ; SLIM-DISK
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	OXFORD UNIV PRESS
WOS记录号	WOS:000478053200067
资助机构	National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; UK Space Agency ; UK Space Agency ; Hundred Talents Program of the Chinese Academy of Sciences ; Hundred Talents Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; UK Space Agency ; UK Space Agency ; Hundred Talents Program of the Chinese Academy of Sciences ; Hundred Talents Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; UK Space Agency ; UK Space Agency ; Hundred Talents Program of the Chinese Academy of Sciences ; Hundred Talents Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; UK Space Agency ; UK Space Agency ; Hundred Talents Program of the Chinese Academy of Sciences ; Hundred Talents Program of the Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/27202]
专题	中国科学院国家天文台
通讯作者	Cheng, Huaqing; Liu, Bifang
作者单位	1.Chinese Acad Sci, Natl Astron Observ, Key Lab Space Astron & Mchnol, 20A Datun Rd, Beijing 100101, Peoples R China 2.Univ Chinese Acad Sci, Sch Astron & Space Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China 3.Univ Coll London, Mullard Space Sci Lab, Holmbury St Mary, Dorking RH5 6NT, Surrey, England
推荐引用方式 GB/T 7714	Cheng, Huaqing,Yuan, Weimin,Liu, He-Yang,et al. Modelling accretion disc emission with generalized temperature profile and its effect on AGN spectral energy distribution[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2019,487(3):3884-3903.
APA	Cheng, Huaqing,Yuan, Weimin,Liu, He-Yang,Breeveld, Alice. A.,Jin, Chichuan,&Liu, Bifang.(2019).Modelling accretion disc emission with generalized temperature profile and its effect on AGN spectral energy distribution.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,487(3),3884-3903.
MLA	Cheng, Huaqing,et al."Modelling accretion disc emission with generalized temperature profile and its effect on AGN spectral energy distribution".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 487.3(2019):3884-3903.