Astronomy and Astrophysics – Astrophysics
Scientific paper
1997-09-29
Astronomy and Astrophysics
Astrophysics
10 pages, including 1 postscript figure, LaTeX, mn.sty, accepted to MNRAS
Scientific paper
10.1046/j.1365-8711.1998.01224.x
In the framework of the fluctuation-dissipation approach to dynamical friction, we derive an expression giving the orbital energy exchange experienced by a compound body as it moves interacting with a non homogeneous discrete background. The body is assumed to be composed of particles endowed with a velocity spectrum and with a non homogeneous spatial distribution. The Chandrasekhar formula is recovered in the limit of a point-like satellite with zero velocity dispersion and infinite temperature moving through an homogeneous infinite medium. In this same limit, but dropping the zero satellite velocity dispersion ($\sigma_S$) condition, the orbital energy loss is found to be smaller than in the $\sigma_S=0$ case by a factor of up to an order of magnitude in some situations.
Domínguez-Tenreiro Rosa
Gomez-Flechoso M. A.
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