Depolarization of extended radio sources by a foreground Faraday screen

Details Depolarization of extended radio sources by a foreground Faraday screen Depolarization of extended radio sources by a foreground Faraday screen

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.250..726t&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 250, June 15, 1991, p. 726-736.

Astronomy and Astrophysics

Astronomy

68

Depolarization, Faraday Effect, Radio Sources (Astronomy), Plasma-Electromagnetic Interaction, Polarized Electromagnetic Radiation

Scientific paper

The observed polarization properties of an extended polarized radio source situated behind an irregular foreground Faraday screen are studied. Depolarization laws are derived for both a uniform and a linear source. The polarization behavior is not strongly dependent on the assumed power spectrum of rotation measure (RM) fluctuations and generally behaves as a power law of wavelength when the root mean square rotated angle exceeds unity, a much slower fall off than given by Burn's formula. Polarization fluctuations are large, and the observation of patchy depolarization does not necessarily imply a clumpy foreground screen. The observed width of the RM distribution does not depend on the assumed RM power spectrum. Internal and foreground depolarization have a similar wavelength dependence, and separating them will be difficult. Deductions of the screen properties from a Burn-type law are likely to be false. The properties of the depolarization screens in the Coma galaxy cluster and about quasars are estimated or constrained.

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