tokens: The authors thank the referee for his/her comments. The scientific results reported in this article are based on data obtained from the Chandra Data Archive and observations obtained with XMM - Newton , an ESA science mission with instruments and contributions directly funded by ESA Member States and NASA. The research leading to these results has received funding from the European Research Council under the European Union’s Seventh Framework Programme (FP72007-2013) ERC grant agreement No. 340519. M.A., P.M., E.P., and G.W.P. acknowledge partial funding support from NASA grant NNX14AC22G. F.A.-S. acknowledges support from Chandra grant GO3-14131X.
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