Propagation-induced circular polarisation in synchrotron sources

Details Propagation-induced circular polarisation in synchrotron sources Propagation-induced circular polarisation in synchrotron sources

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998pasa...15..211k&link_type=abstract

Publications Astronomical Society of Australia, vol. 15, no. 2, p. 211-216

Astronomy and Astrophysics

Astronomy

31

Polarisation, Radiative Transfer, Radio Continuum

Scientific paper

The small degree of circular polarisation observed in some synchrotron sources has a frequency dependence that is not consistent with simple predictions based on the intrinsic circular polarisation of synchrotron emission. The suggestion is explored that the circular polarisation arises as a propagation effect within the source. The physical basis of this alternative mechanism is the fact that the natural wave modes of a synchrotron emitting gas are linearly polarised, allowing partial conversion of linear into circular polarisation as in a quarter-wave plate. A relativistic rotation measure (RRM) is defined to characterise the magnitude of this effect.

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