The dependence of the galaxy luminosity function on large-scale environment

	The dependence of the galaxy luminosity function on large-scale environment
	Mo, HJ ; Yang, XH ; van den Bosch, FC ; Jing, YP
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2004-03-21
卷号	349 期号:1 页码:205-212
关键词	methods : statistical galaxies : haloes dark matter large-scale structure of Universe
英文摘要	A basic assumption in the current halo-occupation model is that the properties of a galaxy depend only on the mass of its dark matter halo. An important consequence of this is that the segregation of the galaxy population by large-scale environment is entirely due to the environmental dependence of the halo population. In this paper, we use such a model to predict how the galaxy luminosity function depends on large-scale environment. The latter is represented by the density contrast (delta) averaged over a spherical volume of radius R = 8 h(-1) Mpc. The model predicts that the Schechter function is a good approximation to the luminosity functions of galaxies brighter than similar to10(9) h(-2) L-. (b(J)-band) in virtually all environments. The characteristic luminosity, L*, increases moderately with delta. The faint-end slope, alpha, on the other hand, is quite independent of. However, when splitting the galaxy population into early and late types, it is found that for late types, is virtually constant, whereas for early types, increases from similar to -0.3 in underdense regions (delta similar to -0.5) to similar to -0.8 in highly overdense regions (delta similar to 10). The luminosity function at L-bJ < 10(9) h(-2) L-. is significantly steeper than the extrapolation of the Schechter function that fits the brighter galaxies. This steepening is more significant for early types and in low-density environments. The model also predicts that the luminosity density and the mass density are closely correlated. The relation between the two is monotonic but highly non-linear. This suggests that one can use the luminosity density, averaged over a large volume, to rank the mass density. This, in turn, allows the environmental effects predicted here to be tested by observations.
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 ; REDSHIFT SURVEY ; OCCUPATION DISTRIBUTION ; ELLIPSOIDAL COLLAPSE ; LOCAL UNIVERSE ; ANALYTIC MODEL ; VOIDS ; BIAS ; Z=0
收录类别	SCI
语种	英语
WOS记录号	WOS:000220152700023
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/18315]
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.Univ Sci & Technol China, Ctr Astrophys, Hefei 230026, Anhui, Peoples R China 3.ETH Honggerberg, Swiss Fed Inst Technol, Inst Astron, CH-8093 Zurich, Switzerland 4.Max Planck Inst Astrophys, D-85748 Garching, Germany 5.Shanghai Astron Observ, Shanghai 200030, Peoples R China 6.Partner Grp MPA, Shanghai 200030, Peoples R China
推荐引用方式 GB/T 7714	Mo, HJ,Yang, XH,van den Bosch, FC,et al. The dependence of the galaxy luminosity function on large-scale environment[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2004,349(1):205-212.
APA	Mo, HJ,Yang, XH,van den Bosch, FC,&Jing, YP.(2004).The dependence of the galaxy luminosity function on large-scale environment.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,349(1),205-212.
MLA	Mo, HJ,et al."The dependence of the galaxy luminosity function on large-scale environment".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 349.1(2004):205-212.