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Local Group Analogs in Lambda CDM Cosmological Simulations

文献类型：期刊论文

作者Zhai, Meng1,2; Guo, Qi3,4; Zhao, Gang1,4; Gu, Qing3,4; Liu, Ang5
刊名ASTROPHYSICAL JOURNAL
出版日期2020-02-10
卷号890期号:1页码:11
ISSN号0004-637X
DOI10.3847/1538-4357/ab6986
英文摘要We use semi-analytic galaxy catalogs based on two high-resolution cosmological N-body simulations, Millennium-WMAP7 and Millennium-II, to investigate the formation of Local Group (LG) analogs. Unlike previous studies, we use the observed stellar masses to select the LG member (Milky Way (MW) and M31) analogs, and then impose constraints using the observed separation, isolation, and kinematics of the two main member galaxies. By comparing radial and low-ellipticity orbits between the MW and M31, we find higher tangential velocity results in higher total mass, which are 4.4(-1.5)(+2.4) x 10(12)M(circle dot) and 6.6(-1.5)(+2.7) x 10(12)M(circle dot) for radial and low-ellipticity orbits. The orbits also influence the individual mass distribution of MW and M31 analogs. For radial orbits, typical host halo masses of the MW and M31 are 1.5(-0.7)(+1.4) x 10(12)M(circle dot) and 2.5(-1.1)(+1.3) x 10(12)M(circle dot); for low-ellipticity orbits, the masses are 2.5(-1.4)(+2.2) x 10(12)M(circle dot) and 3.8(-1.8)(+2.8) x 10(12)M(circle dot). The LG is located primarily in filaments with tails extending toward higher densities up to delta similar to 4.5. The dark matter velocity anisotropy parameters beta of both the MW and M31 analogs are close to zero in the center, increasing to 0.2-0.3 at 50-80 kpc and decreasing slowly outward. The slope is much flatter than computed from the MW satellites, and the amplitude is smaller than traced by halo stars. Values of beta from different tracers agree at similar to 120 kpc where beta similar to 0.2. We also find that model predictions agree broadly with observations in the radial distribution and luminosity function of satellites around the MW and M31.
WOS关键词DIGITAL SKY SURVEY ; MATTER HALO MASS ; MILKY-WAY ; DARK ; GALAXIES ; SATELLITES ; EVOLUTION ; POPULATION ; KINEMATICS ; PARAMETERS
资助项目National Natural Science Foundation of China[11988101] ; National Natural Science Foundation of China[11890694] ; National Natural Science Foundation of China[11622325] ; National Natural Science Foundation of China[11573033] ; National Natural Science Foundation of China[11573032] ; National Natural Science Foundation of China[11873052] ; National Natural Science Foundation of China[11973049] ; National Natural Science Foundation of China[11390371] ; National Key R&D Program of China[2019YFA0405502] ; National Key R&D Program of China[2018YFA0404503] ; National Key R&D Program of China[2017YFB0203300] ; NAOC Nebula Talents Program ; Strategic Priority Research Program of Chinese Academy of Sciences[XDA15016200] ; Chinese Academy of Sciences (CAS) ; Royal Society Newton Advanced Fellowships
WOS研究方向Astronomy & Astrophysics
语种英语
出版者IOP PUBLISHING LTD
WOS记录号WOS:000522095800027
资助机构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 ; NAOC Nebula Talents Program ; NAOC Nebula Talents Program ; Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; Chinese Academy of Sciences (CAS) ; Chinese Academy of Sciences (CAS) ; Royal Society Newton Advanced Fellowships ; Royal Society Newton Advanced Fellowships ; 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 ; NAOC Nebula Talents Program ; NAOC Nebula Talents Program ; Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; Chinese Academy of Sciences (CAS) ; Chinese Academy of Sciences (CAS) ; Royal Society Newton Advanced Fellowships ; Royal Society Newton Advanced Fellowships ; 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 ; NAOC Nebula Talents Program ; NAOC Nebula Talents Program ; Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; Chinese Academy of Sciences (CAS) ; Chinese Academy of Sciences (CAS) ; Royal Society Newton Advanced Fellowships ; Royal Society Newton Advanced Fellowships ; 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 ; NAOC Nebula Talents Program ; NAOC Nebula Talents Program ; Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; Chinese Academy of Sciences (CAS) ; Chinese Academy of Sciences (CAS) ; Royal Society Newton Advanced Fellowships ; Royal Society Newton Advanced Fellowships
源URL[http://ir.bao.ac.cn/handle/114a11/55694]  
专题中国科学院国家天文台
通讯作者Guo, Qi
作者单位1.Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ, Beijing 100012, Peoples R China
2.Chinese Acad Sci, South Amer Ctr Astron, Natl Astron Observ, Beijing 100012, Peoples R China
3.Chinese Acad Sci, Key Lab Computat Astrophys, Natl Astron Observ, Beijing 100012, Peoples R China
4.Univ Chinese Acad Sci, 19 A Yuquan Rd, Beijing 100049, Peoples R China
5.INAF Osservatorio Astrofis Arcetri, I-50125 Florence, Italy
推荐引用方式
GB/T 7714		 Zhai, Meng,Guo, Qi,Zhao, Gang,et al. Local Group Analogs in Lambda CDM Cosmological Simulations[J]. ASTROPHYSICAL JOURNAL,2020,890(1):11.
APA Zhai, Meng,Guo, Qi,Zhao, Gang,Gu, Qing,&Liu, Ang.(2020).Local Group Analogs in Lambda CDM Cosmological Simulations.ASTROPHYSICAL JOURNAL,890(1),11.
MLA Zhai, Meng,et al."Local Group Analogs in Lambda CDM Cosmological Simulations".ASTROPHYSICAL JOURNAL 890.1(2020):11.

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