The build up of the correlation between halo spin and the large-scale structure

	The build up of the correlation between halo spin and the large-scale structure
	Wang, Peng; Kang, Xi
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2018
卷号	473 期号:2 页码:1562-1569
英文摘要	Both 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.
语种	英语
WOS记录号	WOS:000423731200010
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/18060]
专题	中国科学院紫金山天文台
推荐引用方式 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.