Halo Intrinsic Alignment: Dependence on Mass, Formation Time, and Environment
Xia, Qianli; Kang, Xi; Wang, Peng; Luo, Yu; Yang, Xiaohu; Jing, Yipeng; Wang, Huiyuan; Mo, Houjun
2017
发表期刊ASTROPHYSICAL JOURNAL
卷号848期号:1页码:22-
摘要In this paper we use high-resolution cosmological simulations to study halo intrinsic alignment and its dependence on mass, formation time, and large-scale environment. In agreement with previous studies using N-body simulations, it is found that massive halos have stronger alignment. For the first time, we find that for a given halo mass older halos have stronger alignment and halos in cluster regions also have stronger alignment than those in filaments. To model these dependencies, we extend the linear alignment model with inclusion of halo bias and find that the halo alignment with its mass and formation time dependence can be explained by halo bias. However, the model cannot account for the environment dependence, as it is found that halo bias is lower in clusters and higher in filaments. Our results suggest that halo bias and environment are independent factors in determining halo alignment. We also study the halo alignment correlation function and find that halos are strongly clustered along their major axes and less clustered along the minor axes. The correlated halo alignment can extend to scales as large as 100 h(-1) Mpc, where its feature is mainly driven by the baryon acoustic oscillation effect.
语种英语
文献类型期刊论文
条目标识符http://libir.pmo.ac.cn/handle/332002/17559
专题中国科学院紫金山天文台研究生部_学生文章
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GB/T 7714
Xia, Qianli,Kang, Xi,Wang, Peng,et al. Halo Intrinsic Alignment: Dependence on Mass, Formation Time, and Environment[J]. ASTROPHYSICAL JOURNAL,2017,848(1):22-.
APA Xia, Qianli.,Kang, Xi.,Wang, Peng.,Luo, Yu.,Yang, Xiaohu.,...&Mo, Houjun.(2017).Halo Intrinsic Alignment: Dependence on Mass, Formation Time, and Environment.ASTROPHYSICAL JOURNAL,848(1),22-.
MLA Xia, Qianli,et al."Halo Intrinsic Alignment: Dependence on Mass, Formation Time, and Environment".ASTROPHYSICAL JOURNAL 848.1(2017):22-.
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