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tokens: We acknowledge useful discussion with S. Ettori, G. Brunetti, G. Ghisellini, R. Decarli, E. Torresi, E. Lusso, S. Gallerani. We thank the anonymous referee for his/her useful comments and suggestions that improved the quality of this work. We acknowledge financial contribution from the agreement ASI-INAF n.2017-14-H.O and ASI-INAF I/037/12/0. The scientific results reported in this article are based on observations made by the Chandra X-ray Observatory. This work made use of data taken under the ESO program ID 095.A-0714(A). FC acknowledges funding from the INAF PRIN-SKA 2017 program 1.05.01.88.04.