EPISODIC RANDOM ACCRETION AND THE COSMOLOGICAL EVOLUTION OF SUPERMASSIVE BLACK HOLE SPINS
文献类型：期刊论文
| 作者 | Wang JM(王建民) ; Hu C(胡晨); Li YR(李彦荣); Chen YM(陈燕梅); Yan CS(闫昌硕); Zhang S(张澍); Wang, JM; Hu, C; Li, YR; Chen, YM
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| 刊名 | ASTROPHYSICAL JOURNAL LETTERS
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| 出版日期 | 2009 |
| 卷号 | 697期号:2页码:L141-L144 |
| 关键词 | black hole physics galaxies: evolution quasars: general |
| 通讯作者 | [Wang, Jian-Min ; Hu, Chen ; Li, Yan-Rong ; Chen, Yan-Mei ; Yan, Chang-Shuo ; Zhang, Shu] Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100049, Peoples R China ; [Wang, Jian-Min] Chinese Acad Sci, Ctr Theoret Phys, Sci Facil, Beijing 100049, Peoples R China ; [King, Andrew R.] Univ Leicester, Theoret Astrophys Grp, Leicester LE1 7RH, Leics, England ; [Marconi, Alessandro] Univ Florence, Dept Astron & Space Sci, I-50125 Florence, Italy ; [Ho, Luis C.] Observ Carnegie Inst Washington, Pasadena, CA 91101 USA ; [Staubert, Ruediger] Univ Tubingen, Abt Astron, IAAT, D-72076 Tubingen, Germany |
| 英文摘要 | The growth of supermassive black holes (BHs) located at the centers of their host galaxies comes mainly from the accretion of gas, but how to fuel them remains an outstanding unsolved problem in quasar evolution. This issue can be elucidated by quantifying the radiative efficiency parameter (eta) as a function of redshift, which also provides constraints on the average spin of the BHs and its possible evolution with time. We derive a formalism to link eta with the luminosity density, BH mass density, and duty cycle of quasars, quantities we can estimate from existing quasars, and galaxy survey data. We find that eta has a strong cosmological evolution: at z approximate to 2, eta approximate to 0.3, and by z approximate to 0 it has decreased by an order of magnitude, to eta approximate to 0.03. We interpret this trend as evolution in BH spin, and we appeal to episodic, random accretion as the mechanism for reducing the spin. The observation that the fraction of radio-loud quasars decreases with increasing redshift is inconsistent with the popular notion that BH spin is a critical factor for generating strong radio jets. In agreement with previous studies, we show that the derived history of BH accretion closely follows the cosmic history of star formation, consistent with other evidence that BHs and their host galaxies co-evolve. |
| 学科主题 | Astronomy & Astrophysics |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 原文出处 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000266073800016 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/240249]  |
| 专题 | 高能物理研究所_粒子天体物理中心 高能物理研究所_实验物理中心 |
| 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 | Wang JM,Hu C,Li YR,et al. EPISODIC RANDOM ACCRETION AND THE COSMOLOGICAL EVOLUTION OF SUPERMASSIVE BLACK HOLE SPINS[J]. ASTROPHYSICAL JOURNAL LETTERS,2009,697(2):L141-L144. |
| APA | 王建民.,胡晨.,李彦荣.,陈燕梅.,闫昌硕.,...&Zhang, S.(2009).EPISODIC RANDOM ACCRETION AND THE COSMOLOGICAL EVOLUTION OF SUPERMASSIVE BLACK HOLE SPINS.ASTROPHYSICAL JOURNAL LETTERS,697(2),L141-L144. |
| MLA | 王建民,et al."EPISODIC RANDOM ACCRETION AND THE COSMOLOGICAL EVOLUTION OF SUPERMASSIVE BLACK HOLE SPINS".ASTROPHYSICAL JOURNAL LETTERS 697.2(2009):L141-L144. |
入库方式： OAI收割
来源：高能物理研究所
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