THE NATURE OF RED DWARF GALAXIES

	THE NATURE OF RED DWARF GALAXIES
	Wang, Yu 1; Yang, Xiaohu 1; Mo, H. J.2; van den Bosch, Frank C.3; Katz, Neal 2; Pasquali, Anna 3; McIntosh, Daniel H.4; Weinmann, Simone M.5
刊名	ASTROPHYSICAL JOURNAL
	2009-05-20
卷号	697 期号:1 页码:247-257
关键词	dark matter galaxies: halos large-scale structure of universe
英文摘要	Using dark matter halos traced by galaxy groups selected from the Sloan Digital Sky Survey Data Release 4, we find that about 1/4 of the faint galaxies ((0.1)M(r) - 5 log h > -17.05, hereafter dwarfs) that are the central galaxies in their own halo are not blue and star forming, as expected in standard models of galaxy formation, but are red. In contrast, this fraction is about 1/2 for dwarf satellite galaxies. Many red dwarf galaxies are physically associated with more massive halos. In total, about similar to 45% of red dwarf galaxies reside in massive halos as satellites, while another similar to 25% have a spatial distribution that is much more concentrated toward their nearest massive halos than other dwarf galaxies. We use mock catalogs to show that the reddest population of nonsatellite dwarf galaxies is distributed within about three times the virial radii of their nearest massive halos. We suggest that this population of dwarf galaxies is hosted by low-mass halos that have passed through their massive neighbors, and that the same environmental effects that cause satellite galaxies to become red are also responsible for the red colors of this population of galaxies. We do not find any significant radial dependence of the population of dwarf galaxies with the highest concentrations, suggesting that the mechanisms operating on these galaxies affect color more than structure. However, over 30% of dwarf galaxies are red and isolated and their origin remains unknown.
学科主题	星系与宇宙学研究中心
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	DIGITAL SKY SURVEY ; STELLAR MASS FUNCTIONS ; N-BODY SIMULATIONS ; DARK-MATTER HALOES ; STAR-FORMATION ; SATELLITE GALAXIES ; DENSITY RELATION ; EVOLUTION ; COLOR ; CLUSTERS
收录类别	SCI
语种	英语
WOS记录号	WOS:000265764000021
公开日期	2010-11-08
内容类型	期刊论文
源URL	[http://119.78.226.72//handle/331011/11887]
专题	上海天文台_星系宇宙学重点实验室
作者单位	1.Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Partner Grp MPA, Shanghai 200030, Peoples R China 2.Univ Massachusetts, Dept Astron, Amherst, MA 01003 USA 3.Max Planck Inst Astron, D-69117 Heidelberg, Germany 4.Univ Missouri, Dept Phys, Kansas City, MO 64110 USA 5.Max Planck Inst Astrophys, D-85748 Garching, Germany
推荐引用方式 GB/T 7714	Wang, Yu,Yang, Xiaohu,Mo, H. J.,et al. THE NATURE OF RED DWARF GALAXIES[J]. ASTROPHYSICAL JOURNAL,2009,697(1):247-257.
APA	Wang, Yu.,Yang, Xiaohu.,Mo, H. J..,van den Bosch, Frank C..,Katz, Neal.,...&Weinmann, Simone M..(2009).THE NATURE OF RED DWARF GALAXIES.ASTROPHYSICAL JOURNAL,697(1),247-257.
MLA	Wang, Yu,et al."THE NATURE OF RED DWARF GALAXIES".ASTROPHYSICAL JOURNAL 697.1(2009):247-257.