Abstract
We consider various physical processes that affect the thermal balance of an X-ray jet. We focus on the rapid cooling of dense jets via bremsstrahlung, and all processes are considered from the viewpoint of their contributions to the jet thermal balance. Jet heating by Compton scattering of hard X-ray photons from the hot corona, the effect of shocks in the jet on heating of the jet, and the transformation of jet kinetic energy into heat via Coulomb collisions between protons of the jet and corona are considered. Numerical values have been obtained for the Galactic microquasar SS 433 based on previous results for modeling the X-ray spectrum of this source. Collisions of the jet particles with the ambient gas turns out to be the most important jet heating mechanism for this source.
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