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A joint XMM-<i>NuSTAR</i> observation of the galaxy cluster Abell 523: Constraints on inverse Compton emission
We present the results of a joint XMM-Newton and NuSTAR observation (200 ks) of the galaxy cluster Abell 523 at $z=0.104$. The peculiar morphology of the cluster radio halo and its outlier position in the radio power P(1.4 GHz) - X-ray luminosity plane make it an ideal candidate for the …