Hypervelocity stars from young stellar clusters in the Galactic Centre

Abstract

The enormous velocities of the so called hypervelocity stars (HVSs) derive, likely, from close interactions with massive black holes, binary stars encounters or supernova explosions. In this paper, we investigate the origin of hypervelocity stars as consequence of the close interaction between the Milky Way central massive black hole and a passing-by young stellar cluster. We found that both single and binary HVSs may be generated in a burst-like event, as the cluster passes near the orbital pericentre. High velocity stars will move close to the initial cluster orbital plane and in the direction of the cluster orbital motion at the pericentre. The binary fraction of these HVS jets depends on the primordial binary fraction in the young cluster. The level of initial mass segregation determines the value of the average mass of the ejected stars. Some binary stars will merge, continuing their travel across and out of the Galaxy as blue stragglers.

arXiv comment11 pages, 10 figures, 1 Table, accepted for publication in MNRAS

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Cited by in corpus (32)

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• Gravitational wave sources from inspiralling globular clusters in the Galactic Centre and similar environments
• Direct N-body simulation of the Galactic centre
• Constraining Milky Way mass with Hypervelocity Stars
• The Hills Mechanism and the Galactic Center S-stars
• Steeper stellar cusps in galactic centers from binary disruption
• Tidal disruption events, main-sequence extreme-mass ratio inspirals and binary star disruptions in galactic nuclei
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• Tidal breakup of triple stars in the Galactic Centre
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• Tidal breakup of quadruple stars in the Galactic Centre
• A dynamical origin for planets in triple star systems
• Binary Natal Kicks in the Galactic Center: X-ray Binaries, Hypervelocity Stars, and Gravitational Waves
• A stream of hypervelocity stars from the Galactic Center
• Supernovae in massive binaries and compact object mergers near supermassive black holes