The Dynamics of Globular Cluster Systems [chapter]

Natarajan Ramamani
1988 The Harlow-Shapley Symposium on Globular Cluster Systems in Galaxies  
This paper describes a project whose aim is to study the dynamics of a globular cluster system using an N-body code modified to include the gravitational field of an isothermal galaxy model. The galaxy and the globular cluster system have the same radii, are spherically symmetric and non-rotating. The evolution is to be followed up to a Hubble time. profiles, (ii) the rate of evolution using the radius of sphere containing a given fraction of total mass, (iii) velocity anisotropy, (iv) the
more » ... ropy, (iv) the distribution of orbital eccentricities, and (iv) the formation and disruption of binaries due to three-body encounters. 3. ASSUMPTIONS 1. The globular cluster system initially has (i) clusters uniformly distributed in radius, (ii) an isotropic velocity distribution and (iii) no rotation. The parent galaxy (i) has a mass profile M(r) = Kr out to some cutoff radius, (ii) is spherically symmetric and (iii) is non-rotating. MODEL The globular cluster system is modelled with 200 equal-mass particles and the galaxy with the value of Κ chosen to have a good fit with a standard mass model of our galaxy (Ostriker and Caldwell 1980). The cutoff radius is chosen to be 50 kpc for both. RESULTS This study has just begun and the preliminary tests show that the modified code conserves energy as well as the unmodified code does over a comparable period of time.
doi:10.1007/978-94-015-1104-9_143 fatcat:zbtpmznh55echa26kgn7xhhdhy