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Recent deep surveys have unravelled a population of faint active galacticnuclei (AGN) in the high redshift Universe, leading to various discussions ontheir nature and their role during the Epoch of Reionization. We usecosmological radiation-hydrodynamics simulations of a bright galaxy at z = 6($M_\star \gtrsim 10^{10} M_\odot$) hosting an actively growing super-massiveblack hole to study the properties of these objects. In particular, we studyhow the black hole and the galaxy co-evolve and what is the relativecontribution of the AGN and of the stellar populations to the luminosity budgetof the system. We find that the feedback from the AGN has no strong effect onthe properties of the galaxy, and does not increase the total ionizingluminosity of the host. The average escape fraction of our galaxy is around$f_{\rm esc} \sim 5\%$. While our galaxy would be selected as an AGN in deepX-ray surveys, most of the UV luminosity is originating from stellarpopulations. This confirms that there is a transition in the galaxy populationfrom star forming galaxies to quasar hosts, with bright Lyman-Break Galaxies(LBGs) with $M_{\rm UV}$ around -22 falling in the overlap region. Our resultsalso suggest that faint AGN do not contribute significantly to reionizing theUniverse.

Modelling a bright z = 6 galaxy at the faint end of the AGN luminosity function