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Fig. 6


Polarised flux density contours from the smoothed RM cube of the combined λ18 cm and λ22 cm data using the differential technique overlaid on a Hα image from the WIYN Observatory. The contour levels are at 120, 160, and 200 μJy beam-1, which corresponds to a 5σ noise level in the individual Stokes U- and Q cubes. In the lower right we show the size of the synthesised beam (43.̋1 × 39.̋6). The red vectors indicate the measured polarised flux density (1″ = 40 μJy beam-1) and the intrinsic magnetic field direction of the emission. The green cross marks the optical centre of M 82 and the blue ellipse the extent of the central optical disk.

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