Are supernova kicks responsible for X-ray binary ejection from young clusters?

J. Sepinsky*, V. Kalogera, K. Belczynski

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


Recent Chandra observations of interacting and starburst galaxies have led us to investigate the apparent correlation between the positions of young star clusters and the positions of Chandra point sources. Assumed to be X-ray binaries (XRBs), these point sources do not seem to coincide with the massive (∼105 M⊙), young (1-50 Myr) stellar clusters that can easily form systems capable of such emission. We use a sophisticated binary evolution and population synthesis code (StarTrack) and a simplified cluster model to track both the X-ray luminosity and the position of XRBs as a function of time. These binaries are born within the cluster potential with self-consistent positions and velocities, and we show that a large fraction (≃70%) can be ejected from the parent as a result of supernova explosions and associated systemic velocities. For brighter sources and cluster masses below ∼10 6 M⊙, we find that the average number of bright XRBs per cluster remains near or below unity, consistent with current observations.

Original languageEnglish (US)
Pages (from-to)L37-L40
JournalAstrophysical Journal
Issue number1 II
StatePublished - Mar 1 2005


  • Galaxies: Star clusters
  • Methods: Statistical
  • X-rays: Binaries

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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