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.

11 pages, 10 figures, 1 Table, accepted for publication in MNRAS

References in corpus (7)

• Binary interaction dominates the evolution of massive stars
• Converting H$\alpha$ Luminosities into Star Formation Rates
• Production of Hypervelocity Stars through Encounters with Stellar-Mass Black Holes in the Galactic Centre
• Predicted Space Motions for Hypervelocity and Runaway Stars: Proper Motions and Radial Velocities for the GAIA Era
• The state of globular clusters at birth II: primordial binaries
• Quantifying the Universality of the Stellar Initial Mass Function in Old Star Clusters
• Transits Probabilities Around Hypervelocity and Runaway Stars

Cited by in corpus (9)

• Steeper stellar cusps in galactic centers from binary disruption
• Massive binary star mergers in galactic nuclei: implications for blue stragglers, binary S-stars and gravitational waves
• The MEGaN project I. Missing formation of massive nuclear clusters and tidal disruption events by star clusters - massive black hole interactions
• Tidal breakup of triple stars in the Galactic Centre
• Evidence of a Decreased Binary Fraction for Massive Stars Within 20 Milliparsecs of the Supermassive Black Hole at the Galactic Center
• The apparent tail of the Galactic center object G2/DSO
• The fate of close encounters between binary stars and binary supermassive black holes
• Transits Probabilities Around Hypervelocity and Runaway Stars
• Candidate Hypervelocity Red Clump Stars in the Galactic Bulge Found Using the VVV and Gaia Surveys