The retention of black holes in globular clusters

Abstract: We simulate the velocities of formed Black Holes to determine the fraction of retained Black Holes in 152 Globular Clusters. The model we used for the escape velocity is from Plummer. The scenarios of the natal kick are Neutronstar like kicks and momentum conserving kicks. We also consider the binary fraction which affect the retention of Black Holes. A typical Globular Cluster retains 0 or 102 Black Hole with NS-like kicks or momentum conserving kicks respectively in the simulation which only consider Black Holes as single stars. If the binary fraction fb is three quarters, a typical Globular Cluster retains 102.5 Black Holes with two scenarios.