Computer Science – Performance
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008an....329.1008g&link_type=abstract
Astronomische Nachrichten, Vol.329, Issue , p.1008-1011
Computer Science
Performance
Celestial Mechanics, Stellar Dynamics, Galaxy: Center, Methods: N-Body Simulations
Scientific paper
We describe a novel N-body code designed for simulations of the central regions of galaxies containing massive black holes. The code incorporates Mikkola's ``algorithmic'' chain regularization scheme including post-Newtonian terms up to PN2.5 order. Stars moving beyond the chain are advanced using a fourth-order integrator with forces computed on a GRAPE board. Performance tests confirm that the hybrid code achieves better energy conservation, in less elapsed time, than the standard scheme and that it reproduces the orbits of stars tightly bound to the black hole with high precision. The hybrid code is applied to two sample problems: the effect of finite-N gravitational fluctuations on the orbits of the S-stars; and inspiral of an intermediate-mass black hole into the galactic centre.
Gualandris Alessia
Harfst Stefan
Merritt David
Mikkola Seppo
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