Relativistic dynamical friction in a collisional fluid

Abstract

The dynamical friction force experienced by a body moving at relativistic speed in a gaseous medium is examined. This force, which arises due to the gravitational interaction of the body with its own gravitationally-induced wake, is calculated for straight-line and circular motion, generalizing previous results by several authors. Possible applications to the study of extreme mass-ratio inspirals around strongly-accreting supermassive black holes are suggested.

9 pages and 1 figure. Accepted for publication in MNRAS. Replaced to include minor changes made in proof

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