Simplified spectrum and power formulae for resonant inverse Compton scattering in a strong magnetic field

The resonant inverse Compton scattering (RICS) of a relativistic electron i n an intense magnetic field is an important radiation mechanism in hard X-r ay and gamma -ray astrophysics. So far the available formulae describing RI CS radiation are quite complicate in mathematics and not easy to understand in physics. In this Letter, we present the markedly simplified, analytical formulae for both the spectral and the total power of the RICS process. We will show that the RICS radiation has good monochromaticity which concentr ates in hard X-ray and gamma -ray wavebands, and has extremely high efficie ncy when compared with the coexistent, nonresonant inverse Compton scatteri ng, if the "accommodation condition", derived in this Letter, is satisfied. (C) 2001 Elsevier Science B.V. All rights reserved.