Synchrotron radiation from quasi-monoenergetic electrons Modelling the spectrum of Sagittarius A

We investigate the spectrum of a quasi-monoenerge- tic ensemble of relativistic electrons, especially for the mildly relativistic case, and discuss the effect of inclination of the mag- netic eld on the emissivity. We apply the exact theoretical de- scription to the spectrum of the radio source Sgr A* which is located at or very close to the dynamical center of our Galaxy. We nd that the radio-MIR spectrum can be reproduced well, but that the resulting self-comptonized X-ray flux is much smaller than the observed one.