LOFAR wide-field image of the area around M51. This image represents a 6 h integration using 34 MHz (204 sub-bands) of bandwidth centered on 151 MHz taken with the HBA. The noise in the image is σ ~ 1 mJy beam-1 in the vicinity of M51 and σ ~ 0.6 mJy beam-1 away from bright sources with an effective beamsize of 20″ (Mulcahy et al., in prep.).
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