圖片來源: Adapted from Algaba 2013, MNRAS 429, 3551
Left: VLBA rotation measure (RM) map of 3C 216 from 12 to 24 GHz. A clear gradient transverse to the direction of the jet is observed. Thick line indicates the region where slice is taken. Right: Slice of the RM and fractional polarization. Beamsize is indicated by the horizontal line in the bottom left. Fractional polarization shows indications of an increase towards the edges of the jet.
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