Gravothermal Expansion in an $N$-Body System

Details Gravothermal Expansion in an $N$-Body System Gravothermal Expansion in an $N$-Body System

1993-08-31

arxiv.org/abs/astro-ph/9308046v1

Astronomy and Astrophysics

Astrophysics

25pp and 12 figures (available from d.c.heggie@ed.ac.uk), tex

Scientific paper

This paper describes the numerical evolution of an $N$-body system with a slight ``temperature inversion''; i.e. the maximum velocity dispersion occurs not at the centre but further out. Fluid models predict that the core of such a system expands on a time-scale of thousands of central relaxation times, and here this behaviour is qualitatively confirmed for an $N$-body system of over 3000 bodies. With certain qualifications, this demonstrates the existence in N-body systems of one of the fundamental mechanisms which, in fluid models, drive the gravothermal oscillations discovered by Bettwieser & Sugimoto.

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