Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 389, Issue 1, Pages 2-12Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2008.13557.x
Keywords
stellar dynamics; methods: N-body simulations; galaxy: centre
Categories
Funding
- NWO [643200503]
- NSF [AST-0420920, AST-0437519]
- NASA [NNX07AH15G]
- STScl [HST-AR-09519.01-A]
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [0807910] Funding Source: National Science Foundation
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We describe a novel N-body code designed for simulations of the central regions of galaxies containing massive black holes. The code incorporates Mikkolas '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, ill 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.
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