The origin of IRS 16: dynamically driven inspiral of a dense star cluster to the Galactic center?

Details The origin of IRS 16: dynamically driven inspiral of a dense star cluster to the Galactic center? The origin of IRS 16: dynamically driven inspiral of a dense star cluster to the Galactic center?

2003-03-27

arxiv.org/abs/astro-ph/0303599v2

Astrophys.J. 593 (2003) 352

Astronomy and Astrophysics

Astrophysics

15 pages, Accepted for publiction in ApJ

Scientific paper

10.1086/376439

We use direct N-body simulations to study the inspiral and internal evolution of dense star clusters near the Galactic center. These clusters sink toward the center due to dynamical friction with the stellar background, and may go into core collapse before being disrupted by the Galactic tidal field. If a cluster reaches core collapse before disruption, its dense core, which has become rich in massive stars, survives to reach close to the Galactic center. When it eventually dissolves, the cluster deposits a disproportionate number of massive stars in the innermost parsec of the Galactic nucleus. Comparing the spatial distribution and kinematics of the massive stars with observations of IRS 16, a group of young He I stars near the Galactic center, we argue that this association may have formed in this way.

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