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Local Group Analogs in ΛCDM Cosmological Simulations
Zhai,Meng1,2; Guo,Qi3,4; Zhao,Gang1,4; Gu,Qing3,4; Liu,Ang5
2020-02-10
Source PublicationThe Astrophysical Journal
ISSN0004-637X
Volume890Issue:1
AbstractAbstract 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 10 and 10 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 10 and 10 for low-ellipticity orbits, the masses are 10 and 10 . The LG is located primarily in filaments with tails extending toward higher densities up to . The dark matter velocity anisotropy parameters β 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 β from different tracers agree at?~120 kpc where β?~?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.
KeywordCold dark matter Local Group Cosmology
DOI10.3847/1538-4357/ab6986
Language英语
WOS IDIOP:0004-637X-890-1-ab6986
PublisherThe American Astronomical Society
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Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/53966
Collection中国科学院国家天文台
Affiliation1.Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, People's Republic of China; gzhao@nao.cas.cn
2.Chinese Academy of Sciences South America Center for Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, People's Republic of China
3.Key Laboratory for Computational Astrophysics, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, People's Republic of China; guoqi@nao.cas.cn
4.University of Chinese Academy of Sciences, No. 19 A Yuquan Road, Beijing, 100049, People’s Republic of China
5.INAF Osservatorio Astrofisico di Arcetri, Largo E. Fermi, I-50125 Firenze, Italy
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Zhai,Meng,Guo,Qi,Zhao,Gang,et al. Local Group Analogs in ΛCDM Cosmological Simulations[J]. The Astrophysical Journal,2020,890(1).
APA Zhai,Meng,Guo,Qi,Zhao,Gang,Gu,Qing,&Liu,Ang.(2020).Local Group Analogs in ΛCDM Cosmological Simulations.The Astrophysical Journal,890(1).
MLA Zhai,Meng,et al."Local Group Analogs in ΛCDM Cosmological Simulations".The Astrophysical Journal 890.1(2020).
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