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Fig. 1.

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Composite image of the galaxy group NGC 507. Optical emission is shown in background (r-band, g-band, and i-band images from the Sloan Digital Sky Survey, SDSS), radio emission is shown in red (LOFAR image presented in this work at 144 MHz with 5.57 arcsec × 8.09 arcsec resolution), and X-ray emission is shown in blue (XMM-Newton image at 0.7–2 keV). The most significant features of the system are labelled and a reference scale is shown in the top-right corner.

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