Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...392...65z&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 392, no. 1, June 10, 1992, p. 65-69. Research supported by Wolf Foundation
Astronomy and Astrophysics
Astrophysics
2
Celestial Mechanics, Collisionless Plasmas, Cosmology, Gravitational Effects, Normal Density Functions, Stellar Motions
Scientific paper
Attention is given to the question of whether there is any dynamical friction if there are no background collisionless particles slower than the test object. A collisionless Maxwellian cutoff from below is shown to be stable on scales shorter than the Jeans scale. A test object launched into such a homogeneous and isotropic background will at first accelerate. The time scale for such an acceleration to be significant is shown to be much larger than the background's dynamical time scale. It is concluded from an analysis of the evolution of the distribution function that, if the Jeans swindle is not invoked, then equipartition might be reached after at least one dynamical time. During this time the background will fragment, with the distribution of fragments tending toward a Maxwellian distribution.
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