NGC 4217 total radio intensity contours on optical image made from the SDSS u, g, r-filters. Radio contours start at 3σ levels given below and increase in powers of 2 (up to 128). The beams are shown in the bottom left corner of each image. The robust parameter of clean was set to zero for all images. Top: combined C-band (C- and D-configuration), uv-tapering of 12 kλ, rms noise σ of 5 μJy beam−1, the beam size is 7.7″ × 7.7″. A red cross indicates the center. The arrows point to feature “A”, which is the finger-like elongation of the disk, and to feature “B”, which shows a sharp cut-off of the radio map and to the off-center peak position in the southwest within the disk. Middle: combined L-band (B-, C-, and D-configurations), σ of 22 μJy beam−1, the beam size is 12.3″ × 13.4″. Bottom: LOFAR 150 MHz, σ of 130 μJy beam−1, The image was smoothed to a beam size of 10″ × 10″. The arrows point to the extended radio emission, which appears to be a double-horn structure. The dumbbell-shape is overlayed in yellow.
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