GALAXY FORMATION WITH COLD GAS ACCRETION AND EVOLVING STELLAR INITIAL MASS FUNCTION

	GALAXY FORMATION WITH COLD GAS ACCRETION AND EVOLVING STELLAR INITIAL MASS FUNCTION
	Kang, Xi1,2 ; Lin, W. P.3; Skibba, Ramin 2,4; Chen, D. N.5
刊名	ASTROPHYSICAL JOURNAL
	2010-04-20
卷号	713 期号:2 页码:1301-1309
关键词	galaxies: evolution galaxies: high-redshift galaxies: star formation methods: numerical
ISSN号	0004-637X
英文摘要	The evolution of the galaxy stellar mass function is especially useful to test the current model of galaxy formation. Observational data have revealed a few inconsistencies with predictions from the.CDM model. For example, most massive galaxies have already been observed at very high redshifts, and they have experienced only mild evolution since then. In conflict with this, semi-analytical models (SAMs) of galaxy formation predict an insufficient number of massive galaxies at high redshift and a rapid evolution between redshift 1 and 0. In addition, there is a strong correlation between star formation rate (SFR) and stellar mass for star-forming galaxies, which can be roughly reproduced with the model, but with a normalization that is too low at high redshift. Furthermore, the stellar mass density obtained from the integral of the cosmic star formation history is higher than the measured one by a factor of 2. In this paper, we study these issues using an SAM that includes (1) cold gas accretion in massive halos at high redshift; (2) tidal stripping of stellar mass from satellite galaxies; and (3) an evolving stellar initial mass function (IMF; bottom-light) with a higher gas recycle fraction. Our results show that the combined effects from (1) and (2) can predict sufficiently massive galaxies at high redshifts and reproduce their mild evolution at low redshift, while the combined effects of (1) and (3) can reproduce the correlation between SFR and stellar mass for star-forming galaxies across a wide range of redshifts. A bottom-light/top-heavy stellar IMF could partly resolve the conflict between the stellar mass density and cosmic star formation history.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	STAR-FORMATION HISTORY ; BRIGHTEST CLUSTER GALAXIES ; NEAR-INFRARED PROPERTIES ; ACTIVE GALACTIC NUCLEI ; UV LUMINOSITY FUNCTION ; LAMBDA-CDM UNIVERSE ; ULTRA-DEEP-FIELD ; HIGH-REDSHIFT ; FORMING GALAXIES ; SEMIANALYTICAL MODEL
收录类别	SCI
语种	英语
WOS记录号	WOS:000276329400050
公开日期	2011-11-23
内容类型	期刊论文
源URL	[http://159.226.72.40/handle/332002/1159]
专题	中国科学院紫金山天文台
作者单位	1.Purple Mt Observ, Nanjing 210008, Peoples R China 2.Max Planck Inst Astron, D-69117 Heidelberg, Germany 3.Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China 4.Univ Arizona, Steward Observ, Tucson, AZ 85721 USA 5.Beijing Planetarium, Beijing 100044, Peoples R China
推荐引用方式 GB/T 7714	Kang, Xi,Lin, W. P.,Skibba, Ramin,et al. GALAXY FORMATION WITH COLD GAS ACCRETION AND EVOLVING STELLAR INITIAL MASS FUNCTION[J]. ASTROPHYSICAL JOURNAL,2010,713(2):1301-1309.
APA	Kang, Xi,Lin, W. P.,Skibba, Ramin,&Chen, D. N..(2010).GALAXY FORMATION WITH COLD GAS ACCRETION AND EVOLVING STELLAR INITIAL MASS FUNCTION.ASTROPHYSICAL JOURNAL,713(2),1301-1309.
MLA	Kang, Xi,et al."GALAXY FORMATION WITH COLD GAS ACCRETION AND EVOLVING STELLAR INITIAL MASS FUNCTION".ASTROPHYSICAL JOURNAL 713.2(2010):1301-1309.