INTERNAL KINEMATICS OF GROUPS OF GALAXIES IN THE SLOAN DIGITAL SKY SURVEY DATA RELEASE 7

	INTERNAL KINEMATICS OF GROUPS OF GALAXIES IN THE SLOAN DIGITAL SKY SURVEY DATA RELEASE 7
	Li, Cheng 1,2; Jing, Y. P.1,2; Mao, Shude3,4 ; Han, Jiaxin 1,2; Peng, Qiuying 1,2; Yang, Xiaohu 1,2; Mo, H. J.5; van den Bosch, Frank 6
刊名	ASTROPHYSICAL JOURNAL
	2012-10-10
卷号	758 期号:1
关键词	dark matter galaxies: halos large-scale structure of universe methods: statistical
英文摘要	We present measurements of the velocity dispersion profile (VDP) for galaxy groups in the final data release of the Sloan Digital Sky Survey (SDSS). For groups of given mass, we estimate the redshift-space cross-correlation function (CCF) with respect to a reference galaxy sample, xi((s))(r(p), pi), the projected CCF, w(p) (r(p)), and the real-space CCF, xi(cg)(r). The VDP is then extracted from the redshift distortion in xi((s))(r(p), pi), by comparing xi((s))(r(p), pi) with xi(cg)(r). We find that the velocity dispersion (VD) within virial radius (R-200) shows a roughly flat profile, with a slight increase at radii below similar to 0.3R(200) for high-mass systems. The average VD within the virial radius, sigma(v), is a strongly increasing function of central galaxy mass. We apply the same methodology to N-body simulations with the concordance. cold dark matter cosmology but different values of the density fluctuation parameter sigma(8), and we compare the results to the SDSS results. We show that the sigma(v) - M-* relation from the data provides stringent constraints on both sigma(8) and sigma(ms), the dispersion in log M-* of central galaxies at fixed halo mass. Our best-fitting model suggests sigma(8) = 0.86 +/- 0.03 and sigma(ms) = 0.16 +/- 0.03. The slightly higher value of s8 compared to the WMAP7 result might be due to a smaller matter density parameter assumed in our simulations. Our VD measurements also provide a direct measure of the dark matter halo mass for central galaxies of different luminosities and masses, in good agreement with the results obtained by Mandelbaum et al. from stacking the gravitational lensing signals of the SDSS galaxie.
收录类别	SCI
语种	英语
WOS记录号	WOS:000309520500050
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/6273]
专题	国家天文台_星系宇宙学研究部
作者单位	1.Shanghai Astron Observ, Max Planck Inst Astrophys, Partner Grp, Shanghai 200030, Peoples R China 2.Chinese Acad Sci, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China 3.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 4.Univ Manchester, Jodrell Bank, Ctr Astrophys, Manchester M13 9PL, Lancs, England 5.Univ Massachusetts, Dept Astron, Amherst, MA 01003 USA 6.Yale Univ, Dept Astron, New Haven, CT 06520 USA
推荐引用方式 GB/T 7714	Li, Cheng,Jing, Y. P.,Mao, Shude,et al. INTERNAL KINEMATICS OF GROUPS OF GALAXIES IN THE SLOAN DIGITAL SKY SURVEY DATA RELEASE 7[J]. ASTROPHYSICAL JOURNAL,2012,758(1).
APA	Li, Cheng.,Jing, Y. P..,Mao, Shude.,Han, Jiaxin.,Peng, Qiuying.,...&van den Bosch, Frank.(2012).INTERNAL KINEMATICS OF GROUPS OF GALAXIES IN THE SLOAN DIGITAL SKY SURVEY DATA RELEASE 7.ASTROPHYSICAL JOURNAL,758(1).
MLA	Li, Cheng,et al."INTERNAL KINEMATICS OF GROUPS OF GALAXIES IN THE SLOAN DIGITAL SKY SURVEY DATA RELEASE 7".ASTROPHYSICAL JOURNAL 758.1(2012).