Abstract

In real intensive cosmic sources it is necessary to take into account the Cerenkov reabsorption which restricts the brightness temperature of Cerenkov emission by energies of emitted relativistic electrons. As Cerenkov optical depth is given by τc~N/E, the brightness temperature of emission on frequencies near gyrofrequency is determined by electron energyEr in which τc(Er)=1. It is shown that most of the synchrotron sources (quasars, pulsars) must be powerful sources of Cerenkov emission. In these sources the high density of low frequency Cerenkov emission can give rise to many parametric effects.

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