THE CLUSTERING OF SDSS GALAXY GROUPS: MASS AND COLOR DEPENDENCE

	THE CLUSTERING OF SDSS GALAXY GROUPS: MASS AND COLOR DEPENDENCE
	Wang, Yu 1,2,3,4; Yang, Xiaohu 2,3,4; Mo, H. J.5; Van den Bosch, Frank C.6; Weinmann, Simone M.7; Chu, Yaoquan 1
刊名	ASTROPHYSICAL JOURNAL
	2008-11-10
卷号	687 期号:2 页码:919-935
关键词	dark matter galaxies: halos large-scale structure of universe
英文摘要	We use a large sample of galaxy groups selected from the SDSS data release 4 with an adaptive halo-based group finder to probe how the clustering strength of groups depends on their masses and colors. In particular, we determine the relative biases of groups of different masses, as well as that of groups with the same mass but with different colors. In agreement with previous studies, we find that more massive groups are more strongly clustered, and the inferred mass dependence of the halo bias is in good agreement with predictions for the Lambda CDM concordance cosmology. Regarding the color dependence, we find that groups with red centrals are more strongly clustered than groups of the same mass but with blue centrals. Similar results are obtained when the color of a group is defined to be the total color of its member galaxies. The color dependence is more prominent in less massive groups and becomes insignificant in groups with massesk greater than or similar to 10(14) h(-1) M-circle dot. These results are consistent with those obtained by Yang et al. from an analysis of the 2dFGRS, but inconsistent with those obtained by Berlind et al., who also used an SDSS group catalog. We construct a mock galaxy redshift survey from the large Millennium N-body simulation. Applying our group finder to this mock survey, and analyzing the mock data in exactly the same way as the true data, we are able to accurately recover the intrinsic mass and color dependencies of the halo bias in the model. Interestingly, the semianalytical model reveals the same color dependence of the halo bias as we find in our group catalog. We discuss these results in light of the assembly bias of dark matter halos and the star formation histories of 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]	DARK-MATTER HALOES ; DIGITAL-SKY-SURVEY ; LARGE-SCALE STRUCTURE ; SUPERMASSIVE BLACK-HOLES ; REDSHIFT SURVEY ; OCCUPATION DISTRIBUTION ; ASSEMBLY BIAS ; ENVIRONMENTAL DEPENDENCE ; LUMINOSITY FUNCTION ; AGE-DEPENDENCE
收录类别	SCI
语种	英语
WOS记录号	WOS:000260566700012
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/19459]
专题	上海天文台_星系宇宙学重点实验室
作者单位	1.Univ Sci & Technol China, Ctr Astrophys, Anhua 230026, Peoples R China 2.Shanghai Astron Observ, Partner Grp MPA, Shanghai 200030, Peoples R China 3.Shanghai Astron Observ, JOINGC, Shanghai 200030, Peoples R China 4.Univ Sci & Technol China, Hefei, Peoples R China 5.Univ Massachusetts, Dept Astron, Amherst, MA 01003 USA 6.Max Planck Inst Astron, D-69117 Heidelberg, Germany 7.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 CLUSTERING OF SDSS GALAXY GROUPS: MASS AND COLOR DEPENDENCE[J]. ASTROPHYSICAL JOURNAL,2008,687(2):919-935.
APA	Wang, Yu,Yang, Xiaohu,Mo, H. J.,Van den Bosch, Frank C.,Weinmann, Simone M.,&Chu, Yaoquan.(2008).THE CLUSTERING OF SDSS GALAXY GROUPS: MASS AND COLOR DEPENDENCE.ASTROPHYSICAL JOURNAL,687(2),919-935.
MLA	Wang, Yu,et al."THE CLUSTERING OF SDSS GALAXY GROUPS: MASS AND COLOR DEPENDENCE".ASTROPHYSICAL JOURNAL 687.2(2008):919-935.