1202.4688 (Sverre Aarseth)
Sverre Aarseth
We report on results of fully consistent N-body simulations of globular
cluster models with N = 100 000 members containing neutron stars and black
holes. Using the improved `algorithmic regularization' method of Hellstrom and
Mikkola for compact subsystems, the new code NBODY7 enables for the first time
general relativistic coalescence to be achieved for post-Newtonian terms and
realistic parameters. Following an early stage of mass segregation, a few black
holes form a small dense core which usually leads to the formation of one
dominant binary. The subsequent evolution by dynamical shrinkage involves the
competing processes of ejection and mergers by radiation energy loss. Unless
the binary is ejected, long-lived triple systems often exhibit Kozai cycles
with extremely high inner eccentricity (e > 0.999) which may terminate in
coalescence at a few Schwarzschild radii. A characteristic feature is that
ordinary stars as well as black holes and even BH binaries are ejected with
high velocities. On the basis of the models studied so far, the results suggest
a limited growth of a few remaining stellar mass black holes in globular
clusters.
View original:
http://arxiv.org/abs/1202.4688
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