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On Stellar Migration from Andromeda to the Milky Way
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Recent Gaia observations suggest that some hypervelocity stars (HVSs) might originate from outside the Galaxy. We ask if these HVSs could come from as far as Andromeda. Therefore, we simulate HVSs originating in Andromeda with initial conditions based on attributes of high-velocity stars measured in the Milky Way and a simple model for the gravitational potential of Andromeda and the Milky Way. We evaluate the validity of this scenario based on the simulation results. While we expect the vast majority of HVSs in our Galaxy will originate here, we expect the number of stars present from Andromeda at any one time to be between twelve and 3910, depending upon model assumptions. Further, we analyse the properties of HVSs that are able to reach the Milky Way. We discuss whether they could be detected experimentally based on recent constraints set on the ejection rate of HVSs from the Milky Way centre
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The ejection and detectability of high- and hyper-velocity stars by compact object binaries in globular clusters
Star plus compact-object binary encounters in globular clusters likely ejected about 6,300 Milky Way stars in the last 500 Myr, including roughly 840 stars faster than 500 km/s, almost none of which are detectable in ...
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