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DOI：10.1093/mnras/stad2612.png)
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We propose a scenario in which the Large Magellanic Cloud (LMC) is on its second passage around the Milky Way. Using a series of tailored N-body simulations, we demonstrate that such orbits are consistent with current observational constraints on the mass distribution and relative velocity of both galaxies. The previous pericentre passage of the LMC could have occurred 5-10Gyr ago at a distance greater than or similar to 100kpc, large enough to retain its current population of satellites. The perturbations of the Milky Way halo induced by the LMC look nearly identical to the first-passage scenario, however, the distribution of LMC debris is considerably broader in the second-passage model. We examine the likelihood of current and past association with the Magellanic system for dwarf galaxies in the Local Group, and find that in addition to 10-11 current LMC satellites, it could have brought a further four to six galaxies that have been lost after the first pericentre passage. In particular, four of the classical dwarfs - Carina, Draco, Fornax, and Ursa Minor - each have an similar to 50 percent probability of once belonging to the Magellanic system, thus providing a possible explanation for the 'plane of satellites' conundrum.
Keyword:
Galaxy: kinematics and dynamics
Local Group
Magellanic Clouds
期刊
IF:
4.8
论文数:
7.1W
被引数:
25.0W
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