Fig. 4.
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XMM-Newton 0.7–2 keV-band images smoothed with a Gaussian of 6 arcsec FWHM. Left: full field of view where the neighbouring group NGC 499 is also detected. Grey contours represent the X-ray emission above 5σ. Right: zoom-in on NGC 507. A 3σ LOFAR contour at 144 MHz with 5.57 arcsec × 8.09 arcsec resolution is overlaid in black. The X-ray emission shows a rather complex distribution with two clear discontinuities in the eastern and southern directions, which are marked in blue.
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