Canonical textbook on the subject of radiation from astrophysical objects. Authored by George B. Rybicki and Alan P. Lightman. The latter later left the field to pursue a carrer as a writer and science journalist.

When an electron is accelerated it emits electromagnetic radiation. This book delas with this processes in every imaginable way, from relativisitc electons in vaccuo to plasma exitations. It is a small book at 373 pages, but there is no fluff.