SCYON Abstract

Received on December 11 2011

The Effect of Tidal Field on the Depletion of Dark Matter from Globular Clusters

Authors	E. Ardi (¹) and H. Baumgardt (²)
Affiliation	(¹) Kyoto International University, Kyoto, Japan (²) University of Queensland, Brisbane, Australia
To appear in	Proceedings of the 11-th Asian-Pacific Regional IAU Meeting 2011, 26-29 July 2011, Chiang Mai, Thailand
Contact	eliani.ardi@kyotoiu.ac.jp
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Abstract

Numerical simulations are conducted to follow the evolution of the models of globular clusters composed out of stars and dark matter. We found that the dark matter is depleted from the the center of globular clusters due to dynamical friction and mass segregation of stars. The globular clusters have expelled almost all amount of the dark matter from their cores in 1.5 friction times. An external tidal field depletes the dark matter from globular cluster less than 20 % of the initial value within 2 friction times or more than 80 % of dark matter's initial amount still remains in the outer part of the clusters. This might explain the existence of significant amount of dark matter in the outer part of observed clusters.