Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...247..283s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 247, no. 2, July 1991, p. 283-290.
Astronomy and Astrophysics
Astrophysics
12
Active Galactic Nuclei, Electron Acceleration, Far Infrared Radiation, Galactic Radiation, Quasars, Seyfert Galaxies, Synchrotron Radiation, Electron Energy, Energy Distribution, Kinetic Theory, Relativistic Electron Beams
Scientific paper
A nonthermal origin of the FIR-turnover that appears to be common in Seyfert galaxies and radio-weak quasars is investigated in this paper. If a double power law in the electron energy distribution accounts for turnovers steeper than a 2.5 power-law in the observed synchrotron emission, the observations of the Seyfert galaxies Mrk 1014, I Zw 1 and NGC 4151 require differences in the electron power law energy indices of larger than 2.4 and 4.6, respectively. One rather likely scenario in the nuclear regions of active galaxies is a combination of influences like stochastic acceleration and Coulomb interaction losses to produce the resulting electron energy distribution; this combination of processes readily leads to a concave emission spectrum as required by the observations. This rather general model is also shown to be capable of reproducing the observations quantitatively.
Biermann Peter L.
Crusius-Waetzel A.
Schlickeiser Reinhard
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