Subhalo Abundance and Satellite Spatial Distribution in Milky Way-Andromeda-like Paired Haloes  

作　　者：Kemeng Li Shi Shao Ping He Qing Gu Jie Wang 

机构地区：[1]College of Physics,Jilin University,Changchun 130012,China [2]National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China [3]Center for High Energy Physics,Peking University,Beijing 100871,China [4]School of Astronomy and Space Science,University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Research in Astronomy and Astrophysics》2022年第12期344-352,共9页天文和天体物理学研究（英文版）

基　　金：supported by the National Key R&D Program of China(Nos.2018YFE0202900 and 2022YFA1602901);by the NSFC Grant(Nos.11988101,11873051,12125302 and 12273053);support from the K.C.Wong Education Foundation;the support of CAS Project for Young Scientists in Basic Research,grant No.YSBR-062;the science research grants from the China Manned Spaced Project with No.CMS-CSST-2021-B03;the support of the National Natural Science Foundation of China(Nos.12047569 and 12147217);the Natural Science Foundation of Jilin Province,China(No.20180101228JC);funded by BIS National E-infrastructure capital grant ST/K00042X/1,STFC capital grant ST/H008519/1;STFC Di RAC Operations grant ST/K003267/1 and Durham University。

摘　　要：We study the subhalo and satellite populations in haloes similar to the Milky Way(MW)-Andromeda paired configuration in the Millennium II and P-Millennium simulations.We find subhaloes are 5%–15%more abundant in paired haloes than their isolated counterparts that have the same halo mass and large-scale environmental density.Paired haloes tend to reside in a more isotropic environment than isolated haloes,the shear tensor of their large-scale tidal field is possibly responsible for this difference.We also study the thickness of the spatial distribution of the top 11 most massive satellite galaxies obtained in the semi-analytic galaxy sample constructed from the Millennium II simulation.Moreover,satellites that have lost their host subhaloes due to the resolution limit of the simulation have been taken into account.As a result,we find that the difference in the distribution of the satellite thickness between isolated and paired haloes is indistinguishable,which suggests that the paired configuration is not responsible for the observed plane of satellites in the MW.The results in this study indicate the paired configuration could bring some nonnegligible effect on the subhalo abundance in the investigation of the MW's satellite problems.

关 键 词：galaxies:abundances galaxies:halos galaxies:structure (galaxies:)Local Group (cosmology:)dark matter methods:numerical 

分 类 号：P145.9[天文地球—天体物理]