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Fully Self-Consistent N-body Simulation of Star Cluster in the Galactic Center

Published online by Cambridge University Press:  01 September 2007

M. Fujii ,
M. Iwasawa ,
Y. Funato  and
J. Makino
M. Fujii
Affiliation:
Department of Astronomy, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033 email: fujii@cfca.jp Division of Theoretical Astronomy, National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo, 181-8588 email: makino@cfca.jp
M. Iwasawa
Affiliation:
Department of General System Studies, Graduate School of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro, Tokyo 153-8902 email: iwasawa@cfca.jp, funato@artcompsci.org Division of Theoretical Astronomy, National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo, 181-8588 email: makino@cfca.jp
Y. Funato
Affiliation:
Department of General System Studies, Graduate School of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro, Tokyo 153-8902 email: iwasawa@cfca.jp, funato@artcompsci.org
J. Makino
Affiliation:
Division of Theoretical Astronomy, National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo, 181-8588 email: makino@cfca.jp
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Abstract

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We have developed a new tree-direct hybrid algorithm, “Bridge”. It can simulate small scale systems embedded within large-N systems fully self-consistently. Using this algorithm, we have performed full N-body simulations of star clusters near the Galactic center (GC) and compared the orbital evolutions of the star cluster with those obtained by “traditional” simulations, in which the orbital evolution of the star clusters is calculated from the dynamical friction formula. We found that the inspiral timescale of the star cluster is shorter than that obtained with traditional simulations. Moreover, we investigated the eccentricities of particles escaped from the star cluster. Eccentric orbit of the star cluster can naturally explain the high eccentricities of the observed stars.

Keywords

galaxies: star clustersmethods: n-body simulationsGalaxy: centerkinematics and dynamicsstellar dynamics
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S246: Dynamical Evolution of Dense Stellar Systems , September 2007 , pp. 467 - 468
Copyright
Copyright © International Astronomical Union 2008

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