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Partitioning the Galactic halo with Gaussian Mixture Models
Liang, Xi-Long1,2; Chen, Yu-Qin1,2; Zhao, Jing-Kun1,2; Zhao, Gang1,2
2021-06-01
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
ISSN1674-4527
Volume21Issue:5Pages:13
AbstractThe Galactic halo is supposed to form from merging with nearby dwarf galaxies. In order to probe different components of the Galactic halo, we have applied the Gaussian Mixture Models method to a selected sample of metal poor stars with [Fe/H] < -0.7 dex in the APOGEE DR16 catalogue based on four-parameters, metallicity, [Mg/Fe] ratio and spatial velocity (V-R , V-phi ). Nine groups are identified with four from the halo (group 1, 3, 4 and 5), one from the thick disk (group 6), one from the thin disk (group 8) and one from dwarf galaxies (group 7) by analyzing their distributions in the ([M/H], [Mg/Fe]), (V-R , V-phi ), (Zmax, eccentricity), (Energy, Lz) and ([Mg/Mn], [Al/Fe]) coordinates. The rest of the two groups are respectively caused by observational effect (group 9) and the cross section component (group 2) between the thin disk and the thick disk. It is found that in the extremely outer accreted halo (group 1), stars born in the Milky Way cannot be distinguished from those accreted from other galaxies either chemically or kinematically. In the intermediate metallicity of -1.6 < [Fe/H] < -0.7 dex, the accreted halo is mainly composed of the Gaia-Enceladus-Sausage substructure (group 5), which can be easily distinguished from group 4 (the in-situ halo group) in both chemical and kinematic space. Some stars of group 4 may come from the disk and some disk stars can be scattered to high orbits by resonant effects as shown in the Zmax versus Energy coordinate. We also displayed the spatial distribution of main components of the halo and the ratio of accreted components do not show clear relation to the Galactic radius.
KeywordGalaxy abundances Galaxy kinematics Galaxy structure
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; 2-m Chinese Space Survey Telescope project ; 2-m Chinese Space Survey Telescope project ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Alfred P. Sloan Foundation ; Alfred P. Sloan Foundation ; U.S. Department of Energy Office of Science ; U.S. Department of Energy Office of Science ; Center for High-Performance Computing at the University of Utah ; Center for High-Performance Computing at the University of Utah ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; 2-m Chinese Space Survey Telescope project ; 2-m Chinese Space Survey Telescope project ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Alfred P. Sloan Foundation ; Alfred P. Sloan Foundation ; U.S. Department of Energy Office of Science ; U.S. Department of Energy Office of Science ; Center for High-Performance Computing at the University of Utah ; Center for High-Performance Computing at the University of Utah ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; 2-m Chinese Space Survey Telescope project ; 2-m Chinese Space Survey Telescope project ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Alfred P. Sloan Foundation ; Alfred P. Sloan Foundation ; U.S. Department of Energy Office of Science ; U.S. Department of Energy Office of Science ; Center for High-Performance Computing at the University of Utah ; Center for High-Performance Computing at the University of Utah ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; 2-m Chinese Space Survey Telescope project ; 2-m Chinese Space Survey Telescope project ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Alfred P. Sloan Foundation ; Alfred P. Sloan Foundation ; U.S. Department of Energy Office of Science ; U.S. Department of Energy Office of Science ; Center for High-Performance Computing at the University of Utah ; Center for High-Performance Computing at the University of Utah
DOI10.1088/1674-4527/21/5/128
WOS KeywordGAIA DR2 LINKING ; MILKY-WAY ; STELLAR HALO ; RETROGRADE SUBSTRUCTURES ; ELEMENTAL ABUNDANCE ; MOVING GROUPS ; DWARF GALAXY ; PHASE-SPACE ; IN-SITU ; STARS
Language英语
Funding ProjectNational Natural Science Foundation of China[11988101] ; National Natural Science Foundation of China[11625313] ; National Natural Science Foundation of China[11973048] ; National Natural Science Foundation of China[11927804] ; National Natural Science Foundation of China[11890694] ; National Key R&D Program of China[2019YFA0405502] ; 2-m Chinese Space Survey Telescope project ; Fundamental Research Funds for the Central Universities[292020001734 (E0E48956)] ; Alfred P. Sloan Foundation ; U.S. Department of Energy Office of Science ; Center for High-Performance Computing at the University of Utah
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; 2-m Chinese Space Survey Telescope project ; 2-m Chinese Space Survey Telescope project ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Alfred P. Sloan Foundation ; Alfred P. Sloan Foundation ; U.S. Department of Energy Office of Science ; U.S. Department of Energy Office of Science ; Center for High-Performance Computing at the University of Utah ; Center for High-Performance Computing at the University of Utah ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; 2-m Chinese Space Survey Telescope project ; 2-m Chinese Space Survey Telescope project ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Alfred P. Sloan Foundation ; Alfred P. Sloan Foundation ; U.S. Department of Energy Office of Science ; U.S. Department of Energy Office of Science ; Center for High-Performance Computing at the University of Utah ; Center for High-Performance Computing at the University of Utah ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; 2-m Chinese Space Survey Telescope project ; 2-m Chinese Space Survey Telescope project ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Alfred P. Sloan Foundation ; Alfred P. Sloan Foundation ; U.S. Department of Energy Office of Science ; U.S. Department of Energy Office of Science ; Center for High-Performance Computing at the University of Utah ; Center for High-Performance Computing at the University of Utah ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; 2-m Chinese Space Survey Telescope project ; 2-m Chinese Space Survey Telescope project ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Alfred P. Sloan Foundation ; Alfred P. Sloan Foundation ; U.S. Department of Energy Office of Science ; U.S. Department of Energy Office of Science ; Center for High-Performance Computing at the University of Utah ; Center for High-Performance Computing at the University of Utah
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000663159400001
PublisherNATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/77463
Collection中国科学院国家天文台
Corresponding AuthorChen, Yu-Qin
Affiliation1.Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 100049, Peoples R China
2.Chinese Acad Sci, Natl Astron Observ, CAS Key Lab Opt Astron, Beijing 100101, Peoples R China
Recommended Citation
GB/T 7714
Liang, Xi-Long,Chen, Yu-Qin,Zhao, Jing-Kun,et al. Partitioning the Galactic halo with Gaussian Mixture Models[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2021,21(5):13.
APA Liang, Xi-Long,Chen, Yu-Qin,Zhao, Jing-Kun,&Zhao, Gang.(2021).Partitioning the Galactic halo with Gaussian Mixture Models.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,21(5),13.
MLA Liang, Xi-Long,et al."Partitioning the Galactic halo with Gaussian Mixture Models".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 21.5(2021):13.
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