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The effect of the Large Magellanic Cloud on the satellite galaxy population in Milky Way analogous galaxies
Zhang, Dali1,2; Luo, Yu1; Kang, Xi1,2
2019-06-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume486Issue:2Pages:2440-2448
Corresponding AuthorLuo, Yu(luoyu@pmo.ac.cn)
AbstractObservational work has shown that the two brightest satellite galaxies of the Milky Way (MW), the Large Magellanic Cloud (LMC) and Small Magellanic Cloud (SMC), are rare amongst MW analogues. It is therefore interesting to know whether the presence of massive satellites has any effect on the full satellite population of MW analogues. In this article, we investigate this problem using a semi-analytical model combined with the Millennium-II simulation. MW-analogous galaxies are defined to have similar stellar mass or dark matter halo mass to the MW. We find that, in the first case, the halo mass is larger and there are, on average, twice as many satellites in MW analogues if there is a massive satellite galaxy in the system. This is mainly from the halo formation bias. The difference is smaller if MW analogues are selected using halo mass. We also find that the satellite distribution is slightly asymmetric, being more concentrated on the line connecting the central galaxy and the massive satellite and that, on average, the LMC has brought in 14.7 satellite galaxies with M-r < 0 at its accretion, among which 4.5 satellites are still within a distance of 50 kpc from the LMC. Considering other satellites, we predict that there are 7.8 satellites within 50 kpc of the LMC. By comparing our model with the early data of Satellites Around Galactic Analogs (SAGA), a survey to observe satellite galaxies around 100 MW analogues, we find that SAGA has more bright satellites and fewer faint satellites than our model predictions. A future comparison with the final SAGA data is needed.
Keywordgalaxies: dwarf galaxies: haloes Local Group Magellanic Clouds
DOI10.1093/mnras/stz957
WOS KeywordRADIAL-DISTRIBUTION ; DWARF SPHEROIDALS ; STAR-FORMATION ; HALO MASS ; DARK ; EVOLUTION ; CLUSTER ; COLORS ; MODELS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000474899400075
PublisherOXFORD UNIV PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/27410
Collection中国科学院紫金山天文台
Corresponding AuthorLuo, Yu
Affiliation1.Partner Grp MPI Astron, Purple Mt Observ, 2 West Beijing Rd, Nanjing 210008, Peoples R China
2.Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Anhui, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Dali,Luo, Yu,Kang, Xi. The effect of the Large Magellanic Cloud on the satellite galaxy population in Milky Way analogous galaxies[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2019,486(2):2440-2448.
APA Zhang, Dali,Luo, Yu,&Kang, Xi.(2019).The effect of the Large Magellanic Cloud on the satellite galaxy population in Milky Way analogous galaxies.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,486(2),2440-2448.
MLA Zhang, Dali,et al."The effect of the Large Magellanic Cloud on the satellite galaxy population in Milky Way analogous galaxies".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 486.2(2019):2440-2448.
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