Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...263..595h&link_type=abstract
Astrophysical Journal, Part 1, vol. 263, Dec. 15, 1982, p. 595-598.
Astronomy and Astrophysics
Astrophysics
17
Circular Polarization, Extragalactic Radio Sources, Interstellar Magnetic Fields, Nonuniform Magnetic Fields, Synchrotron Radiation, Elliptical Polarization, Faraday Effect, Linear Polarization, Opacity
Scientific paper
Partial coupling between normal modes in a radio synchrotron source with a nonuniform magnetic field direction allows conversion of linear polarization into elliptical polarization during propagation through the source. The amount of conversion is calculated under the assumptions of quasi-transverse propagation and a magnetic field direction which is a linear function of distance within the source. For a source with opacity of order unity a change in magnetic field direction as small as 1 deg results in about 0.25% circular polarization, which is comparable to observed values. No linear-to-elliptical conversion takes place in the limits of very low or very high absorption depth. Such a high sensitivity to magnetic field structure must be considered when interpreting circular polarization observations.
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