Faraday Rotation Effect in Extragalactic Radio Sources

Physics

Scientific paper

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Scientific paper

Cooper and Price1 have shown that the polarization of radio emission measured at three different points in the radio source Centaurus A rotated progressively with increasing wave-length. They found the rate of rotation to be proportional to the square of the wave-length. This fact suggested to Cooper and Price a direct explanation in terms of Faraday rotation in a magneto-ionic medium. Recently, Gardner and Whiteoak2 measured the polarization of 18 radio sources at different wave-lengths in order to investigate whether Faraday rotation was present. All the sources showed the quadratic dependence of polarization position-angle on wave-length characteristic of Faraday effect. In the discussion of their results, Gardner and Whiteoak suggested the possibility that some of the Faraday rotation occurs in our Galaxy (Fig. 1 in ref. 2).

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