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Plasma suppression of synchrotron emission from radio-quiet infrared quasars

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2 Author(s)
Schlickeiser, R. ; Max-Planck Inst. for Radioastron., Bonn, West Germany ; Crusius, A.

The authors calculate the synchrotron emission from a power-law distribution of relativistic electrons in a large-scale random magnetic field of strength B embedded in the thermal plasma of density ne. Due to the presence of the plasma, two major modifications of the classical vacuum theory of synchrotron emission are established: (1) synchrotron sources can be optically thick only in a rather small frequency range around the Razin-Tsytovich frequency v R=20 (new/cm-3) (B /G)-1 Hz, whereas at smaller and higher frequencies the sources are optically thin; (2) at frequencies beyond vR the synchrotron intensity in a plasma behaves exactly the same way as in the vacuum case, whereas at frequencies below vR the emitted intensity is exponentially reduced. It is argued that the established low-frequency cutoff at vR due to the plasma suppression may be responsible for the measured sharp cutoff in the far infrared of 23 northern sky radio-quiet IRAS (Infrared Astronomy Satellite) infrared quasars. The cutoffs in the spectra of these radio-quiet quasars may be due to the exponential suppression at frequencies ⩽2×1012 Hz ( ne/108 cm-3) (B/10 -3 G)-1

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Plasma Science, IEEE Transactions on  (Volume:17 ,  Issue: 2 )