Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-12-17
Astrophys.J. 628 (2005) 236-245
Astronomy and Astrophysics
Astrophysics
28 pages in preprint style. 9 figures (1 color), 1 table. Minor modifications reflecting the version accepted by ApJ
Scientific paper
10.1086/430694
We present results from dynamical Monte Carlo simulations of dense star clusters near the Galactic center. These clusters sink toward the center of the Galaxy by dynamical friction. During their inspiral, they may undergo core collapse and form an intermediate-mass black hole through runaway collisions. Such a cluster can then reach within a parsec of the Galactic center before it completely disrupts, releasing many young stars in this region. This scenario provides a natural explanation for the presence of the young stars observed near the Galactic center. Here we determine the initial conditions for this scenario to work and we derive the mass distribution of cluster stars as a function of distance from the Galactic center. For reasonable initial conditions, we find that clusters massive enough for rapid inspiral would include more massive stars (m >~ 30 Msun) than currently observed in the inspiral region. We point out several possible explanations for this apparent discrepancy.
Gürkan Mehmet Atakan
Rasio Frederic A.
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