RMs between λ3 cm and λ6 cm above a 3σ detection limit for each of the two polarised flux density maps used. In the lower left we show the size of the synthesised beam (12.̋5 × 11.̋7). The galactic foreground RM of –20 rad m-2 (Oppermann et al. 2012) was corrected for. The red cross marks the optical centre of the galaxy.
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