Fig. 12.
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IR − IX relation of NGC 507. The high-resolution LOFAR image at 144 MHz is used for the radio. Left: squared boxes, with 8-arcsec (≃3 kpc) side, used to extract surface-brightness values. Right:IR − IX relation obtained using all regions. Points are coloured following the colour scheme shown in the left panel. Circles depict cells where the radio and X-ray surface brightness is above 3σ. The upper limits (arrows) represent cells with radio surface brightness in the range 2σ–3σ. The horizontal black dash-dotted line indicates the 1σ in the LOFAR 144 MHz map. The red and blue lines correspond to the best-fit obtained for the entire emission and for green regions only, respectively. The lower panel shows the residuals of log IR and log IX with respect to the Linmix best fit line obtained using all regions (green+red). A negligible correlation is found with a Spearman coefficient of 0.13 ± 0.06 in the case where all boxes are included (red+green). A mild positive correlation is found instead with a Spearman coefficient equal to rs = 0.50 ± 0.06 and a slope equal to bgreen = 0.63 ± 0.09, if the red boxes are excluded from the fit.
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