Fig. 4

Left: radio emission from the spiral galaxy NGC 1633 (DSS R band in colour) detected at 610 MHz (black contours) and 235 MHz (magenta contours). Contour levels at 610 MHz are −0.2, 0.2, 0.3, 0.45 mJy beam-1. Right: a possible “double-double” radio galaxy with the outer lobes (labeled east and west lobe) and the inner lobes shown in the inset. The 610 MHz contours (positive magenta and red negative contours) and 235 MHz contours (positive blue and cyan negative contours) are overlayed on UKIRT infra-red image shown in colour. Contour levels at 610 MHz are −0.18, 0.18, 0.24, 0.36, 0.48, 0.72, 1.44 mJy beam-1 and at 235 MHz are −1.5, 1.5, 2.0, 2.5, 3.0, 6.0, 12.0 mJy beam-1. The black contours in the inset are of the high resolution 610 MHz image that resolves the core into lobes with contour levels at −0.15, 0.15, 0.3, 0.4, 0.6, 0.8, 1.0 mJy beam-1.
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