Journal
ANNUAL REVIEW OF ASTRONOMY AND ASTROPHYSICS, VOL 53
Volume 53, Issue -, Pages 15-49Publisher
ANNUAL REVIEWS
DOI: 10.1146/annurev-astro-082214-122230
Keywords
black holes; binary stars; stellar kinematics; stellar dynamics; Galactic Center; Galactic halo
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Hypervelocity stars (HVSs) travel with such extreme velocities that dynamical ejection via gravitational interaction with a massive black hole (MBH) is their most likely origin. Observers have discovered dozens of unbound main-sequence stars since the first in 2005, and the velocities, stellar nature, spatial distribution, and overall numbers of unbound B stars in the Milky Way halo all fit an MBH origin. Theorists have proposed various mechanisms for ejecting unbound stars, and these mechanisms can be tested with larger and more complete samples. HVSs' properties are linked to the nature and environment of the Milky Way's MBH, and, with future proper motion measurements, their trajectories may provide unique probes of the dark matter halo that surrounds the Milky Way.
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