Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989itps...17..245s&link_type=abstract
IEEE Transactions on Plasma Science (ISSN 0093-3813), vol. 17, April 1989, p. 245-251.
Astronomy and Astrophysics
Astronomy
5
Cosmic Plasma, Infrared Astronomy Satellite, Quasars, Radio Sources (Astronomy), Relativistic Electron Beams, Synchrotron Radiation, Optical Thickness, Thermal Plasmas
Scientific paper
The synchrotron emission is calculated for a power-law distribution of relativistic electrons in a large-scale random magnetic field of strength B embedded in the thermal plasma of density n(e). It is shown that, due to the presence of the plasma, synchotron sources can be optically thick only in a rather small frequency range around the Razin-Tsytovich frequency nu(R), whereas at smaller and higher frequencies the sources are optically thin. At frequencies beyond nu(R), the synchrotron intensity in a plasma behaves exactly the same way as in the vacuum case, whereas at frequencies below nu(R) the emitted intensity is exponentially reduced. It is argued that the established low-frequency cutoff at nu(R) due to plasma suppression may be responsible for the measured sharp FIR cutoff in 23 northern radio-quiet IRAS IR quasars.
Crusius Andre
Schlickeiser Reinhard
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