Total power radio continuum contours at λ22 cm from the WSRT observations in Adebahr et al. (2013) on a Hα image from the WIYN 3.5 m Observatory. Contours start at a 3σ level of 90μJy/beam and increase in powers of 2. The green cross marks the optical centre of M 82, the red box the bar region, and the blue circle the position of the background point source.
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