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Halo Intrinsic Alignment: Dependence on Mass, Formation Time, and Environment
Xia, Qianli1,2; Kang, Xi1; Wang, Peng1,2; Luo, Yu1; Yang, Xiaohu3; Jing, Yipeng3; Wang, Huiyuan4; Mo, Houjun5,6,7
2017-10-10
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume848Issue:1Pages:11
Abstract

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.

Keyworddark matter galaxies: formation galaxies: halos large-scale structure of universe methods: statistical
DOI10.3847/1538-4357/aa8d17
WOS KeywordWEAK-LENSING SURVEYS ; DARK-MATTER HALOES ; GALAXY ELLIPTICITIES ; REDSHIFT SURVEY ; POWER SPECTRUM ; HORIZON-AGN ; COSMIC WEB ; SIMULATION ; SHAPES ; SPIN
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000412575600002
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/22548
Collection中国科学院紫金山天文台
Corresponding AuthorKang, Xi
Affiliation1.Purple Mt Observ, Partner Grp MPI Astron, 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
3.Shanghai Jiao Tong Univ, Ctr Astron & Astrophys, Shanghai 200240, Peoples R China
4.Univ Sci & Technol China, Dept Astron, Key Lab Res Galaxies & Cosmol, Hefei 230026, Anhui, Peoples R China
5.Tsinghua Univ, Astron Dept, Beijing 10084, Peoples R China
6.Tsinghua Univ, Ctr Astrophys, Beijing 10084, Peoples R China
7.Univ Massachusetts, Dept Astron, Amherst, MA 01003 USA
Recommended Citation
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):11.
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),11.
MLA Xia, Qianli,et al."Halo Intrinsic Alignment: Dependence on Mass, Formation Time, and Environment".ASTROPHYSICAL JOURNAL 848.1(2017):11.
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