Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-03-05
Astronomy and Astrophysics
Astrophysics
8 pages, to appear in "The Formation and Evolution of Massive Young Star Clusters", eds. H.J.G.L.M. Lamers, A. Nota & L. J. Sm
Scientific paper
We discuss the structural change and degree of mass segregation of young dense star clusters within about 100pc of the Galactic center. In our calculations, which are performed with GRAPE-6, the equations of motion of all stars and binaries are calculated accurately but the external potential of the Galaxy is solved (semi)analytically. The simulations are preformed to model the Arches star cluster. We find that star clusters with are less strongly perturbed by the tidal field and dynamical friction are much stronger affected by mass segregation; resulting in a significant pile-up of massive stars in the cluster center. At an age of about 3.5Myr more than 90 per cent of the stars more massive than ~10Msun are concentrated within the half-mass radius of the surviving cluster. Star clusters which are strongly perturbed by the tidal field of the parent Galaxy are much less affected by mass segregation.
Baumgardt Holger
McMillan Stephen
Portegies Zwart Simon
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