COSMOLOGICAL EVOLUTION OF MASSIVE BLACK HOLES: EFFECTS OF EDDINGTON RATIO DISTRIBUTION AND QUASAR LIFETIME

	COSMOLOGICAL EVOLUTION OF MASSIVE BLACK HOLES: EFFECTS OF EDDINGTON RATIO DISTRIBUTION AND QUASAR LIFETIME
	Cao, Xinwu
刊名	ASTROPHYSICAL JOURNAL
	2010-12-01
卷号	725 期号:1 页码:388-393
关键词	accretion black hole physics galaxies: active quasars: general accretion disks
英文摘要	A power-law time-dependent light curve for active galactic nuclei (AGNs) is expected by the self-regulated black hole growth scenario, in which the feedback of AGNs expels gas and shut down accretion. This is also supported by the observed power-law Eddington ratio distribution of AGNs. At high redshifts, the AGN life timescale is comparable with (or even shorter than) the age of the universe, which sets a constraint on the minimal Eddington ratio for AGNs on the assumption of a power-law AGN light curve. The black hole mass function (BHMF) of AGN relics is calculated by integrating the continuity equation of massive black hole number density on the assumption of the growth of massive black holes being dominated by mass accretion with a power-law Eddington ratio distribution for AGNs. The derived BHMF of AGN relics at z = 0 can fit the measured local mass function of the massive black holes in galaxies quite well, provided the radiative efficiency similar to 0.1 and a suitable power-law index for the Eddington ratio distribution are adopted. In our calculations of the black hole evolution, the duty cycle of AGN should be less than unity, which requires the quasar life timescale tau(Q) greater than or similar to 5 x 10(8) years.
学科主题	天体物理学
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	ACTIVE GALACTIC NUCLEI ; EMISSION-LINE PROPERTIES ; LUMINOSITY FUNCTION ; HOST GALAXIES ; GROWTH ; ACCRETION ; CONSTRAINTS ; MASSES ; REDSHIFT ; AGN
收录类别	SCI
语种	英语
WOS记录号	WOS:000284576700054
公开日期	2011-06-29
内容类型	期刊论文
源URL	[http://119.78.226.72//handle/331011/13355]
专题	上海天文台_星系宇宙学重点实验室
作者单位	Chinese Acad Sci, Key Lab Res Galaxies & Cosmol, Shanghai Astron Observ, Shanghai 200030, Peoples R China
推荐引用方式 GB/T 7714	Cao, Xinwu. COSMOLOGICAL EVOLUTION OF MASSIVE BLACK HOLES: EFFECTS OF EDDINGTON RATIO DISTRIBUTION AND QUASAR LIFETIME[J]. ASTROPHYSICAL JOURNAL,2010,725(1):388-393.
APA	Cao, Xinwu.(2010).COSMOLOGICAL EVOLUTION OF MASSIVE BLACK HOLES: EFFECTS OF EDDINGTON RATIO DISTRIBUTION AND QUASAR LIFETIME.ASTROPHYSICAL JOURNAL,725(1),388-393.
MLA	Cao, Xinwu."COSMOLOGICAL EVOLUTION OF MASSIVE BLACK HOLES: EFFECTS OF EDDINGTON RATIO DISTRIBUTION AND QUASAR LIFETIME".ASTROPHYSICAL JOURNAL 725.1(2010):388-393.