Constraints on radiatively inefficient accretion history from Eddington ratio distribution of active galactic nuclei
文献类型：期刊论文
| 作者 | Cao, Xinwu ; Xu, Ya-Di
|
| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 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. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 学科主题 | 星系与宇宙学研究中心 |
| 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 |
| 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. |
入库方式： OAI收割
来源：上海天文台
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