The sidedness of jets and depolarization in powerful extragalactic radio sources

Astronomy and Astrophysics – Astronomy

Scientific paper

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Depolarization, Extragalactic Radio Sources, Polarization Characteristics, Radio Jets (Astronomy), Asymmetry, Faraday Effect, Galaxies, Magnetoionics, Quasars

Scientific paper

The cause of one-sidedness in the jets of otherwise symmetrical extragalactic radio sources is a subject of some controversy. During a study of the polarization properties of powerful radio sources, it became clear that in those sources with one-sided jets, depolarization with increasing wavelength is usually weaker for the lobe containing the jet. One obvious interpretation is that the depolarization is caused by differential Faraday rotation through irregularities in a magnetoionic medium surrounding the radio source. The side with the stronger jet closer to us, is seen through a smaller amount of material and therefore shows less depolarization.

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