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We present the Obelisk project, a cosmological radiation-hydrodynamicssimulation following the assembly and reionization of a protocluster progenitorduring the first two billions of years from the big bang, down to $z = 3.5$.The simulation resolves haloes down to the atomic cooling limit, and tracks thecontribution of different sources of ionization: stars, active galactic nuclei,and collisions. The Obelisk project is designed specifically to study thecoevolution of high redshift galaxies and quasars in an environment favouringblack hole growth. In this paper, we establish the relative contribution ofthese two sources of radiation to reionization and their respective role inestablishing and maintaining the high redshift ionizing background. Our volumeis typical of an overdense region of the Universe and displays star formationrate and black hole accretion rate densities similar to high redshiftprotoclusters. We find that hydrogen reionization happens inside-out and iscompleted by $z \sim 6$ in our overdensity, and is predominantly driven bygalaxies, while accreting black holes only play a role at $z \sim 4$.

The Obelisk simulation: galaxies contribute more than AGN to HI reionization of protoclusters