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Cosmological evolution of the duty cycle of quasars
Wang JM(王建民); Chen YM(陈燕梅); Zhang F(张帆); Wang, JM; Chen, YM; Zhang, F
2006
发表期刊ASTROPHYSICAL JOURNAL
卷号647期号:1页码:L17-L20
通讯作者Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100049, Peoples R China ; Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China
摘要Quasars are powered by accretion onto supermassive black holes, but the problem of the duty cycle related to the episodic activity of the black holes remains one of the major questions of the cosmological evolution of quasars. In this Letter, we obtain quasar duty cycles based on analyses of a large sample composed of 10,979 quasars with redshifts z <= 2.1 from the Sloan Digital Sky Survey (SDSS) Data Release 3 (DR3). We estimate the masses of the quasar black holes and obtain their mass function (MF) in the present sample. We then get the duty cycle (delta) over bar (z) = 10(-3) similar to 1 based on Soltan's argument, implying that black holes are undergoing multiple episodic activity. We find that the duty cycle has a strong evolution. By comparison, we show that the evolution of the duty cycle follows the history of the cosmic star formation rate (SFR) density in the universe, providing intriguing evidence of a natural connection between star formation and the triggering of black hole activity. Feedback on star formation from black hole activity is briefly discussed.
文章类型Article
关键词black hole physics galaxies : active galaxies : evolution galaxies : nuclei quasars : general
学科领域Astronomy & Astrophysics
研究领域[WOS]Astronomy & Astrophysics
DOI10.1086/507271
URL查看原文
语种英语
WOS类目Astronomy & Astrophysics
WOS记录号WOS:000239648000005
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被引频次:41[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/240258
专题粒子天体物理中心
作者单位中国科学院高能物理研究所
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Wang JM,Chen YM,Zhang F,et al. Cosmological evolution of the duty cycle of quasars[J]. ASTROPHYSICAL JOURNAL,2006,647(1):L17-L20.
APA 王建民,陈燕梅,张帆,Wang, JM,Chen, YM,&Zhang, F.(2006).Cosmological evolution of the duty cycle of quasars.ASTROPHYSICAL JOURNAL,647(1),L17-L20.
MLA 王建民,et al."Cosmological evolution of the duty cycle of quasars".ASTROPHYSICAL JOURNAL 647.1(2006):L17-L20.
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