Internal properties and environments of dark matter haloes

	Internal properties and environments of dark matter haloes
	Wang, Huiyuan 1,2; Mo, H. J.3; Jing, Y. P.4; Yang, Xiaohu 4; Wang, Yu 1,2
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2011-05-01
卷号	413 期号:3 页码:1973-1990
关键词	methods: statistical galaxies: haloes dark matter large-scale structure of Universe
英文摘要	We use seven high-resolution N-body simulations to study the correlations among different halo properties (assembly time, spin, shape and substructure), and how these halo properties are correlated with the large-scale environment in which haloes reside. The large-scale tidal field estimated from haloes above a mass threshold is used as our primary quantity to characterize the large-scale environment, while other parameters, such as the local overdensity and the morphology of large-scale structure, are used for comparison. For haloes at a fixed mass, all the halo properties depend significantly on environment, particularly the tidal field. The environmental dependence of halo assembly time is primarily driven by local tidal field. The mass of the unbound fraction in substructure is boosted in strong tidal force region, while the bound fraction is suppressed. Haloes have a tendency to spin faster in a stronger tidal field and the trend is stronger for more massive haloes. The spin vectors show significant alignment with the intermediate axis of the tidal field, as expected from the tidal torque theory. Both the major and minor axes of haloes are strongly aligned with the corresponding principal axes of the tidal field. In general, a halo that can accrete more material after the formation of its main halo on average is younger, more elongated, spins faster and contains a larger amount of substructure. Higher-density environments not only provide more material for haloes to accrete, but also are places of stronger tidal fields that tend to suppress halo accretion. The environmental dependencies are the results of these two competing effects. The tidal field based on haloes can be estimated from observation, and we discuss the implications of our results for the environmental dependence of galaxy properties.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	LARGE-SCALE STRUCTURE ; INTRINSIC ELLIPTICITY CORRELATION ; LUMINOUS RED GALAXIES ; ANGULAR-MOMENTUM ; ASSEMBLY BIAS ; DISK GALAXIES ; MILLENNIUM SIMULATION ; ELLIPSOIDAL COLLAPSE ; PHYSICAL-PROPERTIES ; FORMATION HISTORY
收录类别	SCI
语种	英语
WOS记录号	WOS:000290487700042
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/26420]
专题	上海天文台_星系宇宙学重点实验室
作者单位	1.Univ Sci & Technol China, Key Lab Res Galaxies & Cosmol, Hefei 230026, Anhui, Peoples R China 2.Univ Sci & Technol China, Dept Astron, Hefei 230026, Anhui, Peoples R China 3.Univ Massachusetts, Dept Astron, Amherst, MA 01003 USA 4.Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China
推荐引用方式 GB/T 7714	Wang, Huiyuan,Mo, H. J.,Jing, Y. P.,et al. Internal properties and environments of dark matter haloes[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2011,413(3):1973-1990.
APA	Wang, Huiyuan,Mo, H. J.,Jing, Y. P.,Yang, Xiaohu,&Wang, Yu.(2011).Internal properties and environments of dark matter haloes.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,413(3),1973-1990.
MLA	Wang, Huiyuan,et al."Internal properties and environments of dark matter haloes".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 413.3(2011):1973-1990.