Positrons in compact radio sources

Details Positrons in compact radio sources Positrons in compact radio sources

Jul 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978phrvl..41..135n&link_type=abstract

Physical Review Letters, vol. 41, July 10, 1978, p. 135-138.

Physics

18

Circular Polarization, Extragalactic Radio Sources, Faraday Effect, Pair Production, Positrons, Cold Plasmas, Compton Effect, Frequency Response, X Ray Sources

Scientific paper

Faraday rotation is very small (less than 0.5 rad) in most compact extragalactic radio sources. The usual explanation has been a severe depletion of low-energy particles and absence of cold plasma. It is proposed instead that the radiating particles are an equal mixture of electrons and positrons. Such a plasma can still produce, by propagation effects, circular polarization that varies rapidly, and with a non-inverse-square-root-of-frequency dependence, but it produces no Faraday rotation. Production is discussed and, it is shown that the pairs, once produced, will survive quite well in an expanding source.

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