The cross-correlation between galaxies of different luminosities and colors

	The cross-correlation between galaxies of different luminosities and colors
	Wang, Yu ; Yang, Xiaohu ; Mo, H. J.; van den Bosch, Frank C.
刊名	ASTROPHYSICAL JOURNAL
	2007-08-01
卷号	664 期号:2 页码:608-632
关键词	galaxies : halos large-scale structure of universe methods : statistical
英文摘要	We study the cross-correlation between galaxies of different luminosities and colors, using a sample of 284,489 galaxies selected from SDSS DR4. Galaxies are divided into six samples according to luminosity, and each of these samples is further divided into red and blue subsamples according to their (g-r) colors. Projected autocorrelation is estimated for each subsample, and projected cross-correlation is estimated for each pair of subsamples. At projected separations r(p) greater than or similar to 1 h(-1) Mpc, all correlation functions are roughly parallel, although the correlation amplitude depends systematically on both luminosity and color. On r(p) less than or similar to 1 h(-1) Mpc, the autocorrelation and cross- correlation functions of red galaxies are significantly enhanced relative to the corresponding power laws obtained on larger scales. Such enhancement is absent for blue galaxies and in the cross- correlation between red and blue galaxies. We estimate the relative bias factor on scales r(p) greater than or similar to 1 h(-1) Mpc for each subsample using its autocorrelation function as well as its cross-correlation functions with other subsamples. The relative bias factors obtained from different methods are similar. For blue galaxies the luminosity dependence of the relative bias is strong over the entire luminosity range probed (-23.0 < M-r <= -18.0), while for red galaxies the dependence is weaker and becomes insignificant for luminosities below L*. In order to examine whether a significant stochastic/nonlinear component exists in the bias relation, we study the ratio R-ij equivalent to WiiWjj/W-ij(2), where W-ij is the projected correlation between subsample "i" and "j." Results suggest that a significant stochastic/nonlinear component exists in the relationship between red and blue galaxies, particularly on small scales.
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 ; DARK-MATTER HALOES ; REDSHIFT SURVEY ; ANALYTIC MODEL ; SPECTRAL TYPE ; DEPENDENCE ; MORPHOLOGY ; MASS ; DENSITY ; CATALOG
收录类别	SCI
语种	英语
WOS记录号	WOS:000248675000002
公开日期	2010-11-08
内容类型	期刊论文
源URL	[http://119.78.226.72//handle/331011/11913]
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, Partner Grp MPA, Shanghai 200030, Peoples R China 2.Univ Sci & Technol China, Anhua 230026, Peoples R China 3.Shanghai Astron Observ, JOINGC, Shanghai 200030, Peoples R China 4.Univ Massachusetts, Dept Astron, Amherst, MA 01003 USA 5.Max Planck Inst Astron, D-69117 Heidelberg, Germany
推荐引用方式 GB/T 7714	Wang, Yu,Yang, Xiaohu,Mo, H. J.,et al. The cross-correlation between galaxies of different luminosities and colors[J]. ASTROPHYSICAL JOURNAL,2007,664(2):608-632.
APA	Wang, Yu,Yang, Xiaohu,Mo, H. J.,&van den Bosch, Frank C..(2007).The cross-correlation between galaxies of different luminosities and colors.ASTROPHYSICAL JOURNAL,664(2),608-632.
MLA	Wang, Yu,et al."The cross-correlation between galaxies of different luminosities and colors".ASTROPHYSICAL JOURNAL 664.2(2007):608-632.