Mon. Not. R. Astron. Soc., 486, 2440-2448 (2019/June-3)
The effect of the Large Magellanic Cloud on the satellite galaxy population in Milky Way analogous galaxies.
ZHANG D., LUO Y. and KANG X.
Abstract (from CDS):
Observational 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 Mr < 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.
© 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
galaxies: dwarf - galaxies: haloes - Local Group - Magellanic Clouds
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