Optically-thick accretion discs with advection

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	Optically-thick accretion discs with advection
	Chen, LH; Wu M(吴枚); Wu, M; Shang, RC
刊名	CHINESE PHYSICS
	2002
卷号	11 期号:12 页码:1319-1323
关键词	accretion disc black hole physics SSD ADAF
通讯作者	Tsing Hua Univ, Ctr Astrophys, Beijing 100084, Peoples R China ; Chinese Acad Sci, Inst High Energy Phys, High Energy Astrophys Lab, Beijing 100039, Peoples R China
英文摘要	The structures of optically-thick accretion discs with radial advection have been investigated by the iteration and integration algorithms. The advective cooling term changes mostly the inner part of disc solution, and even results in an optically-thick advection-dominated accretion flow (ADAF). Three distinct branches-the outer Shakufa-Sunyaev disc (SSD), the inner ADAF and the middle transition layer-are found for a super-Eddington disc. The SSD-ADAF transition radius can be estimated as 18(M/M-E)R-G where R-G is the Schwarzschild radius, M is the mass accretion rate and M-E is the Eddington accretion rate. SSD solutions calculated with the iteration and integration methods are identical, while ADAF solutions obtained by these two methods differ greatly. Detailed algorithms and their differences have been analysed. The iteration algorithm is not self-consistent, since it implies that the dimensionless advection factor xi is invariant, but in the inner ADAF region the variation of xi is not negligible. The integration algorithm is always effective for the whole region of an optically-thick disc if the accretion rate is no smaller than 10(-4)M(E). For optically-thin discs, the validity of these two algorithms is different. We suggest that the integration method be employed to calculate the global solution of a disc model without assuming xi to be a constant. We also discuss its application to the emergent continuum spectrum in order to explain observational facts.
学科主题	Physics
类目[WOS]	Physics, Multidisciplinary
研究领域[WOS]	Physics
原文出处	SCI
语种	英语
WOS记录号	WOS:000180295600019
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/239276]
专题	高能物理研究所_粒子天体物理中心高能物理研究所_多学科研究中心
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Chen, LH,Wu M,Wu, M,et al. Optically-thick accretion discs with advection[J]. CHINESE PHYSICS,2002,11(12):1319-1323.
APA	Chen, LH,吴枚,Wu, M,&Shang, RC.(2002).Optically-thick accretion discs with advection.CHINESE PHYSICS,11(12),1319-1323.
MLA	Chen, LH,et al."Optically-thick accretion discs with advection".CHINESE PHYSICS 11.12(2002):1319-1323.