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Astron. Astrophys. 328, 95-106

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Synchrotron radiation from quasi-monoenergetic electrons

Modelling the spectrum of Sagittarius A*

T. Beckert1 and W.J. Duschl1,2

1Institut für Theoretische Astrophysik der Universität Heidelberg, Tiergartenstr. 15, D-69121 Heidelberg, Germany
2Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany

Received 2 May 1997 / Accepted 22 July 1997


We investigate the spectrum of a quasi-monoenergetic ensemble of relativistic electrons, especially for the mildly relativistic case, and discuss the effect of inclination of the magnetic field on the emissivity. We apply the exact theoretical description to the spectrum of the radio source Sgr A* which is located at or very close to the dynamical center of our Galaxy. We find 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.

Key words: Galaxy: center - radiation mechanisms: non-thermal - radio continuum: general - X-rays: general

Send offprint requests to: T. Beckert (tbec@ita.uni-heidelberg.de)

© European Southern Observatory (ESO) 1997

Online publication: October 30, 1997
Last change: March 24, 1998