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The relaxation of galaxy clusters at redshift z=0 in IllustrisTNG simulation
Li, Chao1,2; Zhu, Ling3; Guo, Rui1,2
2020-12-01
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
ISSN1674-4527
Volume20Issue:12Pages:9
AbstractWe study the dynamical states of the 30 most massive galaxy clusters in the TNG100 simulation at redshift z = 0 using three types of tracers: stars, dark matter particles and satellite galaxies. If the massive galaxy cluster is spherically symmetric and relaxed, we can obtain the underlying total mass distribution accurately from its dynamical tracers using the spherical Jeans equations. Although the three tracers of clusters have very different number densities, velocity dispersions and anisotropies, they still trace the same total mass profile. We obtain the total mass profiles of clusters using these tracers separately and compare them with the true mass distributions. We find that: (1) the kinematics of dark matter trace the total mass of all clusters well and the mass inferred from dark matter are generally consistent with the true mass profiles with relative deviations smaller than similar to 25% at all radii; (2) stars in similar to 60% massive clusters are approaching equilibrium and the total mass of these clusters inferred from stars have relative deviations smaller than similar to 50% at all radii. Stellar substructures are rich and the mass inferred from stars tend to be over-estimated in the inner region; and (3) satellite galaxies are unrelaxed in the inner region and become more relaxed as the radius increases. The total mass inferred from satellites are under-estimated in all regions.
Keywordgalaxies: clusters: general galaxies: clusters: dynamical tracers methods: numerical
Funding OrganizationNational Key Research and Development Program of China ; National Key Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
DOI10.1088/1674-4527/20/12/198
WOS KeywordSUBSTRUCTURE ; UNIVERSE ; SAMPLE ; CORES ; MASS
Language英语
Funding ProjectNational Key Research and Development Program of China[2018YFA0404501] ; National Natural Science Foundation of China[11821303] ; National Natural Science Foundation of China[11761131004] ; National Natural Science Foundation of China[11761141012]
Funding OrganizationNational Key Research and Development Program of China ; National Key Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000607973700001
PublisherNATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES
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Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/79927
Collection中国科学院国家天文台
Corresponding AuthorZhu, Ling
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Beijing 100101, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
Recommended Citation
GB/T 7714
Li, Chao,Zhu, Ling,Guo, Rui. The relaxation of galaxy clusters at redshift z=0 in IllustrisTNG simulation[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2020,20(12):9.
APA Li, Chao,Zhu, Ling,&Guo, Rui.(2020).The relaxation of galaxy clusters at redshift z=0 in IllustrisTNG simulation.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,20(12),9.
MLA Li, Chao,et al."The relaxation of galaxy clusters at redshift z=0 in IllustrisTNG simulation".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 20.12(2020):9.
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