tokens: Acknowledgements We thank the anonymous referee for helpful comments that contributed to this paper. We acknowledge helpful conversations with Dave Alexander, Francesca Civano, Andy Fabian, Ryan Hickox, James Mullaney, Kirpal Nandra and Marta Volonteri. JA acknowledges support from ERC Advanced Grant FEEDBACK 340442. AG acknowledges the thales project 383549 that is jointly funded by the European Union and the Greek Government in the framework of the programme ‘Education and lifelong learning’. This work is based in part on observations taken by the CANDELS Multi-Cycle Treasury Program and the 3D-HST Treasury Program (GO 12177 and 12328) with the NASA/ESA HST, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. The scientific results reported in this article are based to a significant degree on observations made by the Chandra X-ray Observatory.
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