tokens: We thank the anonymous referee for comments and suggestions that improved the paper. We acknowledge financial support from INAF under the contracts PRIN-INAF-2011 (“Black Hole growth and AGN feedback through cosmic time”) and PRIN MIUR 2010-2011 (“The dark Universe and the cosmic evolution of baryons”). M.B. acknowledges support from the FP7 Career Integration Grant “eEASy” (CIG 321913). C.F. gratefully acknowledges financial support from PRIN MIUR 2010-2011, project “The Chemical and Dynamical Evolution of the Milky Way and Local Group Galaxies”, prot. 2010LY5N2T. E.P. acknowledges financial support from INAF under the contract PRIN-INAF-2012. Funding for this work has also been provided by the Israel Science Foundation grant 284/13.
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