Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...262..441p&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 262, no. 2, p. 441-454.
Astronomy and Astrophysics
Astronomy
21
Galactic Cosmic Rays, Galactic Nuclei, Radio Jets (Astronomy), Synchrotron Radiation, Astronomical Models, Galactic Evolution, Relativistic Electron Beams
Scientific paper
We investigate the spectral and spatial evolution of relativistic electrons from monoenergetic sources in the steady-state case. The particles are assumed to undergo simultaneously transport by diffusion and convection and energy losses by adiabatic cooling as well as by the synchrotron and inverse-Compton process. The resulting energy spectra are converted to synchrotron spectra with a flux tube geometry for the magnetic field. This model is applied to the 400 pc long spur-like feature, which forms a southern extension of the arc at the galactic center. Apart from systematic discrepancies in the arc region itself, which may originate from contributions of thermal emission and absorption, the model explains the observed behavior. Adiabatic cooling is found to be the dominant energy loss process of electrons radiating at radio frequencies.
Pohl Mario
Reich Wolfgang
Schlickeiser Reinhard
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