Constraints on radiatively inefficient accretion history from Eddington ratio distribution of active galactic nuclei

	Constraints on radiatively inefficient accretion history from Eddington ratio distribution of active galactic nuclei
	Cao, Xinwu; Xu, Ya-Di
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2007-05-01
卷号	377 期号:1 页码:425-429
关键词	accretion black hole physics galaxies : active quasars : general accretion discs
英文摘要	The transition of a standard thin disc to a radiatively inefficient accretion flow (RIAF) is expected to occur when m similar to m(crit)(m =. M/M-Edd). The radiative efficiencies of accretion flows accreting at rates lower than the critical accretion rate m(crit) become significantly lower than those of standard thin discs. It is believed that the initial transition radius is small just after the accretion-mode transition, and then the transition radius increases with decreasing accretion rate, as suggested by some theoretical models and observations. Based on such variable transition radius models, we derive how the accretion rate m(t) evolves with time from the observed Eddington ratio distribution for a sample of low-luminosity active galactic nuclei in the local universe. The derived time-dependent accretion rates m(t) show a rapid decrease after the transition of the standard thin accretion disc to a RIAF, which is consistent with that derived from the hard X-ray background.
学科主题	星系与宇宙学研究中心
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	ADVECTION-DOMINATED ACCRETION ; SUPERMASSIVE BLACK-HOLES ; LINE SEYFERT-1 GALAXIES ; COSMOLOGICAL EVOLUTION ; LUMINOSITY FUNCTION ; RADIO-EMISSION ; QUASARS ; FLOWS ; DISK ; TRANSITION
收录类别	SCI
语种	英语
WOS记录号	WOS:000246797900054
公开日期	2010-11-08
内容类型	期刊论文
源URL	[http://119.78.226.72//handle/331011/12455]
专题	上海天文台_星系宇宙学重点实验室
作者单位	1.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 2.Shanghai Jiao Tong Univ, Dept Phys, Shanghai 200030, Peoples R China
推荐引用方式 GB/T 7714	Cao, Xinwu,Xu, Ya-Di. Constraints on radiatively inefficient accretion history from Eddington ratio distribution of active galactic nuclei[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2007,377(1):425-429.
APA	Cao, Xinwu,&Xu, Ya-Di.(2007).Constraints on radiatively inefficient accretion history from Eddington ratio distribution of active galactic nuclei.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,377(1),425-429.
MLA	Cao, Xinwu,et al."Constraints on radiatively inefficient accretion history from Eddington ratio distribution of active galactic nuclei".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 377.1(2007):425-429.