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tokens: The authors thank the anonymous referee for suggestions that led to important improvements in the paper. The research leading to these results has received funding from the European Union’s Horizon 2020 Programme under the AHEAD project (grant agreement n. 654215). A.T. and E.N.E. would like to thank Boğaziçi University Research Fund Grant Number 13760 for financial support. A.T. acknowledges support by the Study in Italy Grant, Research Under Academic Supervision. F.T. acknowledges support by the Programma per Giovani Ricercatori – anno 2014 “Rita Levi Montalcini”. M.G. is supported by the Lyman Spitzer Jr. Fellowship (Princeton University) and by NASA Chandra GO7-18121X and GO8-19104X. R.S. acknowledges financial contribution from the agreement ASI-INAF n.2017-14-H.0. The authors thank Massimo Cappi for useful discussions. A.T. thanks François Mernier and Jelle de Plaa for useful discussions.