Fig. 3
LOFAR maps of NGC 891 observed at a central frequency of 146.4 MHz with a bandwidth of 34.4 MHz at two different resolutions. Left panel: Resolution of 8.3′′ × 6.5′′ (shown by the filled ellipse in the bottom left corner). Contours are at 3, 5, 8, 12, 18, 32, 44, 64 × σ where σ = 0.29 mJy beam−1 is the rmsnoise level. The location of SN1986J is shown by the white arrow. Right panel: Resolution of 20′′ × 20′′ (shown bythe filled ellipse in the bottom left corner). Contours are at 3, 5, 8, 12, 18, 32, 44, 64, 76 × σ where σ = 0.8 mJy beam−1 is the rms noise level. The features denoted by “(a)” and “(b)” are discussed in Sect. 4. The colour scale is in units of Jy/beam.
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