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Published online by Cambridge University Press: 19 July 2016
The asymmetric depolarization seen in powerful extragalactic double sources with one sided jets may be explained in terms of differential Faraday effects in a halo of gas surrounding the source, provided the halo has a core-radius ~30–100 kpc, and contains a magnetic field of order >1 μGauss tangled on a scale <5 kpc.