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Generation of circular polarization in the process of transfer of radiation within a compact source, due to the presence of relativistic electrons, is discussed. The interpretation of the observations of polarization of compact radio sources in terms of this mechanism (called ‘circular repolarization’) yields the values of 1–10 for the lower limit of the ratio of relativistic to cold electron densities.
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A. G. Pacholczyk (1973) studied this question.
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