SATELLITE ALIGNMENT. I. DISTRIBUTION OF SUBSTRUCTURES AND THEIR DEPENDENCE ON ASSEMBLY HISTORY FROM N-BODY SIMULATIONS

	SATELLITE ALIGNMENT. I. DISTRIBUTION OF SUBSTRUCTURES AND THEIR DEPENDENCE ON ASSEMBLY HISTORY FROM N-BODY SIMULATIONS
	Wang, Yang Ocean 1,2; Lin, W. P.1,2,3; Kang, X.4; Dutton, Aaron 5; Yu, Yu1,2 ; Maccio, Andrea V.5
刊名	ASTROPHYSICAL JOURNAL
	2014-05-01
卷号	786 期号:1 页码:8
关键词	dark matter Galaxy: halo Galaxy: structure methods: numerical methods: statistical
通讯作者	林伟鹏
英文摘要	Observations have shown that the spatial distribution of satellite galaxies is not random, but aligned with the major axes of central galaxies. This alignment is dependent on galaxy properties, such that red satellites are more strongly aligned than blue satellites. Theoretical work conducted to interpret this phenomenon has found that it is due to the non-spherical nature of dark matter halos. However, most studies overpredict the alignment signal under the assumption that the central galaxy shape follows the shape of the host halo. It is also not clear whether the color dependence of alignment is due to an assembly bias or an evolution effect. In this paper we study these problems using a cosmological N-body simulation. Subhalos are used to trace the positions of satellite galaxies. It is found that the shapes of dark matter halos are mis-aligned at different radii. If the central galaxy shares the same shape as the inner host halo, then the alignment effect is weaker and agrees with observational data. However, it predicts almost no dependence of alignment on the color of satellite galaxies, though the late accreted subhalos show stronger alignment with the outer layer of the host halo than their early accreted counterparts. We find that this is due to the limitation of pure N-body simulations where satellite galaxies without associated subhalos ("orphan galaxies") are not resolved. These orphan (mostly red) satellites often reside in the inner region of host halos and should follow the shape of the host halo in the inner region.
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 HALOS ; INTRINSIC ELLIPTICITY CORRELATION ; LUMINOUS RED GALAXIES ; LAMBDA-CDM ; ANISOTROPIC DISTRIBUTION ; MILKY-WAY ; COSMOLOGICAL SIMULATIONS ; HIERARCHICAL-MODELS ; FORMATION TIME ; MERGER RATES
收录类别	SCI
语种	英语
WOS记录号	WOS:000335810700008
公开日期	2015-02-14
内容类型	期刊论文
源URL	[http://119.78.226.72//handle/331011/15784]
专题	上海天文台_星系宇宙学重点实验室
作者单位	1.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China 2.Univ Chinese Acad Sci, Grad Sch, Beijing, Peoples R China 3.Shanghai Jiao Tong Univ, Ctr Astron & Astrophys, Shanghai 200240, Peoples R China 4.Partner Grp MPI Astron, Purple Mt Observ, Nanjing 210008, Peoples R China 5.Max Planck Inst Astron, D-69117 Heidelberg, Germany
推荐引用方式 GB/T 7714	Wang, Yang Ocean,Lin, W. P.,Kang, X.,et al. SATELLITE ALIGNMENT. I. DISTRIBUTION OF SUBSTRUCTURES AND THEIR DEPENDENCE ON ASSEMBLY HISTORY FROM N-BODY SIMULATIONS[J]. ASTROPHYSICAL JOURNAL,2014,786(1):8.
APA	Wang, Yang Ocean,Lin, W. P.,Kang, X.,Dutton, Aaron,Yu, Yu,&Maccio, Andrea V..(2014).SATELLITE ALIGNMENT. I. DISTRIBUTION OF SUBSTRUCTURES AND THEIR DEPENDENCE ON ASSEMBLY HISTORY FROM N-BODY SIMULATIONS.ASTROPHYSICAL JOURNAL,786(1),8.
MLA	Wang, Yang Ocean,et al."SATELLITE ALIGNMENT. I. DISTRIBUTION OF SUBSTRUCTURES AND THEIR DEPENDENCE ON ASSEMBLY HISTORY FROM N-BODY SIMULATIONS".ASTROPHYSICAL JOURNAL 786.1(2014):8.