Escape from a Crisis in Fokker-Planck Models |
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| Authors: | Simon F Portegies Zwart Koji Takahashi |
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| Institution: | (1) Department of Earth Sciences and Astronomy, College of Arts and Sciences, University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan |
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| Abstract: | Recent N-body simulations have shown that there is a serious discrepancy between the results of N-body simulations and the
results of Fokker-Planck simulations for the evolution of globular and rich open clusters under the influence of the galactic
tidal field. In some cases, the lifetime obtained from Fokker-Planck calculations is more than an order of magnitude smaller
than those from N-body simulations. In this paper we show that the principal cause for this discrepancy is an over-simplified
treatment of the tidal field used in previous Fokker-Planck simulations. We performed new Fokker-Planck calculations using
a more appropriate implementation for the boundary condition of the tidal field. The implementation is only possible with
anisotropic Fokker-Planck models, while all previous Fokker-Planck calculations rely on the assumption of isotropy. Our new
Fokker-Planck results agree well with N-body results. Comparison of the two types of simulations gives a better understanding
of the evolution of such clusters.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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