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Title:
Evolution of stellar orbits in the Galactic centre
Authors:
Gualandris, A.; Harfst, S.; Merritt, D.; Mikkola, S.
Affiliation:
AA( Center for Computational Relativity and Gravitation, Rochester Institute of Technology, 78 Lomb Memorial Drive, Rochester, NY 14623), AB(Sterrenkundig Instituut ``Anton Pannekoek'', University of Amsterdam, Kruislaan 403, 1098SJ Amsterdam, The Netherlands), AC( Center for Computational Relativity and Gravitation, Rochester Institute of Technology, 78 Lomb Memorial Drive, Rochester, NY 14623), AD(Tuorla Observatory, University of Turku, Väisäläntie 20, Piikkiö, Finland)
Publication:
Astronomische Nachrichten, Vol.329, Issue , p.1008-1011 (AN Homepage)
Publication Date:
00/2008
Origin:
AN
Keywords:
celestial mechanics, stellar dynamics, Galaxy: center, methods: N-body simulations
DOI:
10.1002/asna.200811048
Bibliographic Code:
2008AN....329.1008G

Abstract

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.
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