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The build up of the correlation between halo spin and the large-scale structure
Wang, Peng1,2; Kang, Xi1
2018
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume473Issue:2Pages:1562-1569
Corresponding AuthorWang, Peng(wangpeng@pmo.ac.cn) ; Kang, Xi(kangxi@pmo.ac.cn)
AbstractBoth simulations and observations have confirmed that the spin of haloes/galaxies is correlated with the large-scale structure (LSS) with a mass dependence such that the spin of low-mass haloes/galaxies tend to be parallel with the LSS, while that of massive haloes/galaxies tend to be perpendicular with the LSS. It is still unclear how this mass dependence is built up over time. We use N-body simulations to trace the evolution of the halo spin-LSS correlation and find that at early times the spin of all halo progenitors is parallel with the LSS. As time goes on, mass collapsing around massive halo is more isotropic, especially the recent mass accretion along the slowest collapsing direction is significant and it brings the halo spin to be perpendicular with the LSS. Adopting the fractional anisotropy (FA) parameter to describe the degree of anisotropy of the large-scale environment, we find that the spin-LSS correlation is a strong function of the environment such that a higher FA (more anisotropic environment) leads to an aligned signal, and a lower anisotropy leads to a misaligned signal. In general, our results show that the spin-LSS correlation is a combined consequence of mass flow and halo growth within the cosmic web. Our predicted environmental dependence between spin and large-scale structure can be further tested using galaxy surveys.
Keywordmethods: numerical methods: statistical Galaxy: halo galaxies: haloes dark matter
DOI10.1093/mnras/stx2466
WOS KeywordDARK-MATTER HALOES ; COSMIC WEB ; ANGULAR-MOMENTUM ; GALAXY DISTRIBUTION ; FILAMENTS ; ALIGNMENT ; CLUSTERS ; EVOLUTION ; ORIENTATION ; SWINGS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000423731200010
PublisherOXFORD UNIV PRESS
Citation statistics
Cited Times:9[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/22200
Collection中国科学院紫金山天文台
Corresponding AuthorWang, Peng; Kang, Xi
Affiliation1.Partner Grp MPI Astron, Purple Mt Observ, 2 West Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China
2.Univ Chinese Acad Sci, Grad Sch, 19A Yuquan Rd, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Wang, Peng,Kang, Xi. The build up of the correlation between halo spin and the large-scale structure[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2018,473(2):1562-1569.
APA Wang, Peng,&Kang, Xi.(2018).The build up of the correlation between halo spin and the large-scale structure.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,473(2),1562-1569.
MLA Wang, Peng,et al."The build up of the correlation between halo spin and the large-scale structure".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 473.2(2018):1562-1569.
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