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Relating the Structure of Dark Matter Halos to Their Assembly and Environment
Chen, Yangyao1,2; Mo, H. J.2; Li, Cheng1; Wang, Huiyuan3,4; Yang, Xiaohu5,6,7; Zhang, Youcai8; Wang, Kai1,2
2020-08-01
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume899Issue:1Pages:16
AbstractWe use a largeN-body simulation to study the relation of the structural properties of dark matter halos to their assembly history and environment. The complexity of individual halo assembly histories can be well described by a small number of principal components (PCs), which, compared to formation times, provide a more complete description of halo assembly histories and have a stronger correlation with halo structural properties. Using decision trees built with the random ensemble method, we find that about 60%, 10%, and 20% of the variances in halo concentration, axis ratio, and spin, respectively, can be explained by combining four dominating predictors: the first PC of the assembly history, halo mass, and two environment parameters. Halo concentration is dominated by halo assembly. The local environment is found to be important for the axis ratio and spin but is degenerate with halo assembly. The small percentages of the variance in the axis ratio and spin that are explained by known assembly and environmental factors suggest that the variance is produced by many nuanced factors and should be modeled as such. The relations between halo intrinsic properties and environment are weak compared to their variances, with the anisotropy of the local tidal field having the strongest correlation with halo properties. Our method of dimension reduction and regression can help simplify the characterization of the halo population and clarify the degeneracy among halo properties.
KeywordGalaxy dark matter halos
Funding OrganizationNational Key R&D Program of China ; National Key R&D Program of China ; National Science Foundation of China ; National Science Foundation of China ; China Scholarship Council ; China Scholarship Council ; National Key R&D Program of China ; National Key R&D Program of China ; National Science Foundation of China ; National Science Foundation of China ; China Scholarship Council ; China Scholarship Council ; National Key R&D Program of China ; National Key R&D Program of China ; National Science Foundation of China ; National Science Foundation of China ; China Scholarship Council ; China Scholarship Council ; National Key R&D Program of China ; National Key R&D Program of China ; National Science Foundation of China ; National Science Foundation of China ; China Scholarship Council ; China Scholarship Council
DOI10.3847/1538-4357/aba597
WOS KeywordCONCENTRATION-REDSHIFT RELATION ; ACCRETION HISTORY ; DIMENSIONALITY REDUCTION ; ELLIPSOIDAL COLLAPSE ; DENSITY PROFILES ; MASS ; COLD ; DEPENDENCE ; GALAXIES ; MODEL
Language英语
Funding ProjectNational Key R&D Program of China[2018YFA0404502] ; National Key R&D Program of China[2018YFA0404503] ; National Science Foundation of China[11821303] ; National Science Foundation of China[11973030] ; National Science Foundation of China[11761131004] ; National Science Foundation of China[11761141012] ; National Science Foundation of China[11833005] ; National Science Foundation of China[11621303] ; National Science Foundation of China[11733004] ; National Science Foundation of China[11890693] ; National Science Foundation of China[11421303] ; China Scholarship Council
Funding OrganizationNational Key R&D Program of China ; National Key R&D Program of China ; National Science Foundation of China ; National Science Foundation of China ; China Scholarship Council ; China Scholarship Council ; National Key R&D Program of China ; National Key R&D Program of China ; National Science Foundation of China ; National Science Foundation of China ; China Scholarship Council ; China Scholarship Council ; National Key R&D Program of China ; National Key R&D Program of China ; National Science Foundation of China ; National Science Foundation of China ; China Scholarship Council ; China Scholarship Council ; National Key R&D Program of China ; National Key R&D Program of China ; National Science Foundation of China ; National Science Foundation of China ; China Scholarship Council ; China Scholarship Council
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000561543600001
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/82159
Collection中国科学院国家天文台
Corresponding AuthorChen, Yangyao
Affiliation1.Tsinghua Univ, Dept Astron, Beijing 100084, Peoples R China
2.Univ Massachusetts, Dept Astron, Amherst, MA 01003 USA
3.Univ Sci & Technol China, Dept Astron, Key Lab Res Galaxies & Cosmol, Hefei 230026, Anhui, Peoples R China
4.Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Anhui, Peoples R China
5.Shanghai Jiao Tong Univ, Sch Phys & Astron, Dept Astron, Shanghai 200240, Peoples R China
6.Shanghai Jiao Tong Univ, Tsung Dao Lee Inst, Shanghai 200240, Peoples R China
7.Shanghai Jiao Tong Univ, Shanghai Key Lab Particle Phys & Cosmol, Shanghai 200240, Peoples R China
8.Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China
Recommended Citation
GB/T 7714
Chen, Yangyao,Mo, H. J.,Li, Cheng,et al. Relating the Structure of Dark Matter Halos to Their Assembly and Environment[J]. ASTROPHYSICAL JOURNAL,2020,899(1):16.
APA Chen, Yangyao.,Mo, H. J..,Li, Cheng.,Wang, Huiyuan.,Yang, Xiaohu.,...&Wang, Kai.(2020).Relating the Structure of Dark Matter Halos to Their Assembly and Environment.ASTROPHYSICAL JOURNAL,899(1),16.
MLA Chen, Yangyao,et al."Relating the Structure of Dark Matter Halos to Their Assembly and Environment".ASTROPHYSICAL JOURNAL 899.1(2020):16.
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