CONSTRAINING THE STAR FORMATION HISTORIES IN DARK MATTER HALOS. I. CENTRAL GALAXIES

	CONSTRAINING THE STAR FORMATION HISTORIES IN DARK MATTER HALOS. I. CENTRAL GALAXIES
	Yang, Xiaohu 1,2; Mo, H. J.3; van den Bosch, Frank C.4; Bonaca, Ana 4; Li, Shijie 2,5; Lu, Yi2 ; Lu, Yu 6; Lu, Zhankui 3
刊名	ASTROPHYSICAL JOURNAL
	2013-06-20
卷号	770 期号:2 页码:115
关键词	dark matter galaxies: formation galaxies: halos
英文摘要	Using the self-consistent modeling of the conditional stellar mass functions across cosmic time by Yang et al., we make model predictions for the star formation histories (SFHs) of central galaxies in halos of different masses. The model requires the following two key ingredients: (1) mass assembly histories of central and satellite galaxies and (2) local observational constraints of the star formation rates (SFRs) of central galaxies as a function of halo mass. We obtain a universal fitting formula that describes the (median) SFH of central galaxies as a function of halo mass, galaxy stellar mass, and redshift. We use this model to make predictions for various aspects of the SFRs of central galaxies across cosmic time. Our main findings are the following. (1) The specific star formation rate at high z increases rapidly with increasing redshift [proportional to(1 + z)(2.5)] for halos of a given mass and only slowly with halo mass (proportional to M-h(0.12)) at a given z, in almost perfect agreement with the specific mass accretion rate of dark matter halos. (2) The ratio between the SFR in the main branch progenitor and the final stellar mass of a galaxy peaks roughly at a constant value, similar to 10(-9.3) h(2) yr(-1), independent of the halo mass or the final stellar mass of the galaxy. However, the redshift at which the SFR peaks increases rapidly with halo mass. (3) More than half of the stars in the present-day universe were formed in halos with 10(11.1) h(-1)M(circle dot) < M-h < 10(12.3) h(-1)M(circle dot) in the redshift range 0.4 < z < 1.9. (4) The star formation efficiencies (SFEs) of central galaxies reveal a "downsizing" behavior, in that the halo "quenching" mass, at which the SFE peaks, shifts from similar to 10(12.5) h(-1)M(circle dot) at z greater than or similar to 3.5 to similar to 10(11.3) h(-1)M(circle dot) at z = 0. (5) At redshift z greater than or similar to 2.5 more than 99% of the stars in the progenitors of massive galaxies are formed in situ, and this fraction decreases as a function of redshift, becoming similar to 60% at z = 0. For a Milky-Way-sized halo of M-h similar to 10(12) h(-1)M(circle dot) more than 80% of all the stars are formed in situ, as opposed to having been accreted from satellite galaxies.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	LYMAN-BREAK GALAXIES ; DIGITAL SKY SURVEY ; CONDITIONAL LUMINOSITY FUNCTION ; PAIRWISE VELOCITY DISPERSION ; STELLAR MASS FUNCTIONS ; SATELLITE GALAXIES ; OCCUPATION DISTRIBUTION ; REDSHIFT SURVEY ; INTRACLUSTER LIGHT ; COOLING FLOWS
收录类别	SCI
语种	英语
WOS记录号	WOS:000320111200033
公开日期	2015-01-26
内容类型	期刊论文
源URL	[http://119.78.226.72//handle/331011/15429]
专题	上海天文台_星系宇宙学重点实验室
作者单位	1.Shanghai Jiao Tong Univ, Ctr Astron & Astrophys, Shanghai 200240, Peoples R China 2.Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China 3.Univ Massachusetts, Dept Astron, Amherst, MA 01003 USA 4.Yale Univ, Dept Astron, New Haven, CT 06520 USA 5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 6.Kavli Inst Particle Astrophys & Cosmol, Stanford, CA 94309 USA
推荐引用方式 GB/T 7714	Yang, Xiaohu,Mo, H. J.,van den Bosch, Frank C.,et al. CONSTRAINING THE STAR FORMATION HISTORIES IN DARK MATTER HALOS. I. CENTRAL GALAXIES[J]. ASTROPHYSICAL JOURNAL,2013,770(2):115.
APA	Yang, Xiaohu.,Mo, H. J..,van den Bosch, Frank C..,Bonaca, Ana.,Li, Shijie.,...&Lu, Zhankui.(2013).CONSTRAINING THE STAR FORMATION HISTORIES IN DARK MATTER HALOS. I. CENTRAL GALAXIES.ASTROPHYSICAL JOURNAL,770(2),115.
MLA	Yang, Xiaohu,et al."CONSTRAINING THE STAR FORMATION HISTORIES IN DARK MATTER HALOS. I. CENTRAL GALAXIES".ASTROPHYSICAL JOURNAL 770.2(2013):115.