Hypervelocity stars from young stellar clusters in the Galactic Centre

G. Fragione*, R. Capuzzo-Dolcetta, P. Kroupa

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

30 Scopus citations


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 HVSs 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.

Original languageEnglish (US)
Pages (from-to)451-460
Number of pages10
JournalMonthly Notices of the Royal Astronomical Society
Issue number1
StatePublished - May 2017


  • Galaxies: star clusters: general
  • Galaxy: centre
  • Galaxy: kinematics and dynamics
  • Stars: kinematics and dynamics

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


Dive into the research topics of 'Hypervelocity stars from young stellar clusters in the Galactic Centre'. Together they form a unique fingerprint.

Cite this