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Fig. 4.

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PSZ2 G099.86+58.45. Top and central rows: full-resolution and 18″ images (weighting=‘Briggs’ and robust=−0.5) at 144 MHz (left) and 650 MHz (right). White-coloured radio contours are drawn at levels of 2.5σrms × [ − 1, 1, 2, 4, 8, 16, 32], with σrms being the noise level at each frequency (see Table 3). The negative contour level is drawn with a dashed white line. We followed Cassano et al. (2019) for the source labelling (their sources 1, 2, and 3 became D, E, and F1+F2, respectively). The dashed white circle in each map shows the R = 0.5RSZ, 500 region obtained from MSZ, 500, with the cross showing the cluster centre. Bottom row: spectral index map between 144 and 650 MHz at 18″ resolution, and correspondent uncertainty map (left and right panels, respectively). uGMRT radio contours at 650 MHz are drawn in black, at the levels 3σrms × [ − 1, 1, 2, 4, 8, 16, 32], with σrms the noise level (see Table 3).

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