Gravothermal expansion in an N-body system | Zendy

Douglas C. Heggie | Zendy; Shogo Inagaki | Zendy; Stephen L. W. McMillan | Zendy

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Gravothermal expansion in an N-body system

Author(s) -

Douglas C. Heggie,

Shogo Inagaki,

Stephen L. W. McMillan

Publication year - 1994

Publication title -

monthly notices of the royal astronomical society

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.058

H-Index - 383

eISSN - 1365-8711

pISSN - 0035-8711

DOI - 10.1093/mnras/271.3.706

Subject(s) - physics , velocity dispersion , relaxation (psychology) , classical mechanics , mechanics , astrophysics , biology , neuroscience , galaxy

This paper describes the numerical evolution of an $N$-body system with aslight ``temperature inversion''; i.e. the maximum velocity dispersion occursnot at the centre but further out. Fluid models predict that the core of such asystem expands on a time-scale of thousands of central relaxation times, andhere this behaviour is qualitatively confirmed for an $N$-body system of over3000 bodies. With certain qualifications, this demonstrates the existence inN-body systems of one of the fundamental mechanisms which, in fluid models,drive the gravothermal oscillations discovered by Bettwieser & Sugimoto.Comment: 25pp and 12 figures (available from d.c.heggie@ed.ac.uk), te

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