Gravitational N-body problem and the validity of concepts of the gas model
Open Access
- 1 January 1985
- journal article
- Published by Oxford University Press (OUP) in Monthly Notices of the Royal Astronomical Society
- Vol. 212 (1) , 189-195
- https://doi.org/10.1093/mnras/212.1.189
Abstract
This paper concerns the relation between N-body systems and continuum models of stellar dynamics. A 1000-body calculation is examined for the validity of concepts used in gaseous models simulating N-body systems. Moments of velocity distribution are defined with respect to subsystems (10 shells). When moments are averaged in time and over a shell large enough, heat flows down the gradient in velocity dispersion. Redistribution of heat is a mechanism which contributes to core-collapse and core–halo formation. The coefficient of heat conductivity is in fair agreement with simple theoretical considerations.Keywords
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