|Authors||Simon F. Portegies Zwart1, Junichiro Makino2, Stephen L.W. McMillan3, Piet Hut4|
|Affiliation||1 MIT, Hubble Fellow,|
2 Tokyo Univeristy,
3 Drexel Univeristy,
We find that clusters within 150 pc of the Galactic center dissolve within ~55 Myr, but their projected densities drop below the background density in the direction of the Galactic center within only a few Myr, effectively making these clusters undetectable after that time.
Detailed observations of the Arches cluster, when taken at face value, suggest that its mass function is unusually flat and that the cluster contains an overabundance of stars more massive than 20 MO. Our dynamical analysis, however, shows that the observed characteristics of the Arches cluster are consistent with a perfectly normal initial mass function. The observed anomalies are caused by a combination of observational selection effects and the dynamical evolution of the cluster. We calibrate the current parameters of the Arches cluster using a normal initial mass function and conclude that the cluster is more massive than $40000 MO, has a half mass radius of about 0.35 pc, and is located between 50 and 90 pc from the Galactic center.