USING MEMBER GALAXY LUMINOSITIES AS HALO MASS PROXIES OF GALAXY GROUPS

	USING MEMBER GALAXY LUMINOSITIES AS HALO MASS PROXIES OF GALAXY GROUPS
	Lu, Yi1 ; Yang, Xiaohu 1,2,3; Shen, Shiyin1
刊名	ASTROPHYSICAL JOURNAL
	2015-05-01
卷号	804 期号:1 页码:1
关键词	dark matter galaxies: halos large-scale structure of universe methods: statistical
英文摘要	Reliable halo mass estimation for a given galaxy system plays an important role in both cosmology and galaxy formation studies. Here we set out to find a way to improve halo mass estimation of those galaxy systems in which a limited number of brightest member galaxies have been observed. Using four mock galaxy samples constructed from semi-analytical formation models, the subhalo abundance matching method, and the conditional luminosity functions, respectively, we find that the luminosity gap between the brightest and the subsequent brightest member galaxies in a halo (group) can be used to reduce significantly. the scatter in the halo mass estimation based on the luminosity of the brightest galaxy alone. Tests show that these corrections can significantly reduce the scatter in the halo mass estimations by similar to 50% to similar to 70% in massive halos depending on which member galaxies are considered. Compared to the traditional ranking method, we find that this method works better for groups with less than five members, or in observations with a very bright magnitude cutoff.
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 ; DATA RELEASE 7 ; COSMOLOGICAL CONSTRAINTS ; OCCUPATION STATISTICS ; SATELLITE KINEMATICS ; REDSHIFT SURVEY ; SDSS DR7 ; VELOCITY DISPERSION ; CROSS-CORRELATION
收录类别	SCI
语种	英语
WOS记录号	WOS:000354189500055
公开日期	2015-08-18
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/18269]
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, Shanghai 200030, Peoples R China 2.Shanghai Jiao Tong Univ, Ctr Astron & Astrophys, Shanghai 200240, Peoples R China 3.Shanghai Jiao Tong Univ, IFSA Collaborat Innovat Ctr, Shanghai 200240, Peoples R China
推荐引用方式 GB/T 7714	Lu, Yi,Yang, Xiaohu,Shen, Shiyin. USING MEMBER GALAXY LUMINOSITIES AS HALO MASS PROXIES OF GALAXY GROUPS[J]. ASTROPHYSICAL JOURNAL,2015,804(1):1.
APA	Lu, Yi,Yang, Xiaohu,&Shen, Shiyin.(2015).USING MEMBER GALAXY LUMINOSITIES AS HALO MASS PROXIES OF GALAXY GROUPS.ASTROPHYSICAL JOURNAL,804(1),1.
MLA	Lu, Yi,et al."USING MEMBER GALAXY LUMINOSITIES AS HALO MASS PROXIES OF GALAXY GROUPS".ASTROPHYSICAL JOURNAL 804.1(2015):1.