Hypervelocity Stars from the Andromeda Galaxy
Blake D. Sherwin, Abraham Loeb, Ryan M. O'Leary

TL;DR
This paper models the expected distribution and origins of hypervelocity stars from Andromeda, predicting their numbers, velocities, and potential observability in the Milky Way and M31.
Contribution
It introduces a detailed simulation of HVSs from M31 considering three mechanisms, highlighting the likely dominant processes and their observational signatures.
Findings
High densities of low-mass HVSs near the MW due to gravitational focusing.
Approximately 1000 HVSs from the first mechanism in the MW halo.
Predicted ~5 hypervelocity RGB stars in M31 halo.
Abstract
Hypervelocity stars (HVSs) discovered in the Milky Way (MW) halo are thought to be ejected from near the massive black hole (MBH) at the galactic centre. In this paper we investigate the spatial and velocity distributions of the HVSs which are expected to be similarly produced in the Andromeda galaxy (M31). We consider three different HVS production mechanisms: (i) the disruption of stellar binaries by the galactocentric MBH; (ii) the ejection of stars by an in-spiraling intermediate mass black hole; and (iii) the scattering of stars off a cluster of stellar-mass black holes orbiting around the MBH. While the first two mechanisms would produce large numbers of HVSs in M31, we show that the third mechanism would not be effective in M31. We numerically calculate 1.2*10^6 trajectories of HVSs from M31 within a simple model of the Local Group and hence infer the current distribution of…
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