Galaxy occupation statistics of dark matter haloes: observational results

	Galaxy occupation statistics of dark matter haloes: observational results
	Yang, XH ; Mo, HJ ; Jing, YP ; van den Bosch, FC
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2005-03-21
卷号	358 期号:1 页码:217-232
关键词	methods : statistical galaxies : haloes dark matter large-scale structure of the Universe
英文摘要	We study the occupation statistics of galaxies in dark matter haloes using galaxy groups identified from the Two-degree Field Galaxy Redshift Survey with the halo-based group finder of Yang et al.. The occupation distribution is considered separately for early- and late-type galaxies, as well as in terms of central and satellite galaxies. The mean luminosity of the central galaxies scales with halo mass approximately as L-c proportional to M-2/3 for haloes with masses M < 10(13) h(-1) M-circle dot, and as L-c proportional to M-1/4 for more massive haloes. The characteristic mass of 10(13) h(-1) M-circle dot is consistent with the mass scale where galaxy formation models suggest a transition from efficient to inefficient cooling. Another characteristic halo mass scale, M similar to 10(11) h(-1) M-circle dot, which cannot be probed directly by our groups, is inferred from the conditional luminosity function (CLF) that matches the observed galaxy luminosity function and clustering. For a halo of given mass, the distribution of L-c is rather narrow. A detailed comparison with mock galaxy redshift surveys indicates that this implies a fairly deterministic relation between L-c and the halo mass. The satellite galaxies, however, are found to follow a Poissonian number distribution, in excellent agreement with the occupation statistics of dark matter subhaloes. This provides strong support for the standard lore that satellite galaxies reside in subhaloes. The central galaxies in low-mass haloes are mostly late-type galaxies, while those in massive haloes are almost all early types. We also measure the CLF of galaxies in haloes of given mass. Over the mass range that can be reliably probed with the present data, 13.3 less than or similar to log [M/( h(-1) M-circle dot)] less than or similar to 14.7, the CLF is reasonably well fitted by a Schechter function. Contrary to recent claims based on semi-analytical models of galaxy formation, the presence of central galaxies does not show up as a strong peak at the bright end of the CLF. The CLFs obtained from the observational data are in good agreement with the CLF model obtained by matching the observed luminosity function and large-scale clustering properties of galaxies in the standard Lambda cold dark matter model.
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 ; TO-LIGHT FUNCTION ; REDSHIFT SURVEY ; LUMINOSITY FUNCTION ; VELOCITY DISPERSION ; VIRIAL MASSES ; MODELS ; CLUSTERS ; CATALOG ; 2DFGRS
收录类别	SCI
语种	英语
WOS记录号	WOS:000227478900022
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/19392]
专题	上海天文台_星系宇宙学重点实验室
作者单位	1.Univ Massachusetts, Dept Astron, Amherst, MA 01003 USA 2.Shanghai Astron Observ, Partner Grp MPA, Shanghai 200030, Peoples R China 3.ETH Honggerberg, Swiss Fed Inst Technol, Dept Phys, CH-8093 Zurich, Switzerland
推荐引用方式 GB/T 7714	Yang, XH,Mo, HJ,Jing, YP,et al. Galaxy occupation statistics of dark matter haloes: observational results[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2005,358(1):217-232.
APA	Yang, XH,Mo, HJ,Jing, YP,&van den Bosch, FC.(2005).Galaxy occupation statistics of dark matter haloes: observational results.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,358(1),217-232.
MLA	Yang, XH,et al."Galaxy occupation statistics of dark matter haloes: observational results".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 358.1(2005):217-232.