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We have recently improved our model of active galactic nucleus (AGN) byattaching the supermassive black hole (SMBH) to a massive nuclear star cluster(NSC). Here we study the effects of this new model in massive, gas-richgalaxies with several simulations of different feedback recipes with thehydrodynamics code RAMSES. These simulations are compared to a referencesimulation without any feedback, in which the cooling halo gas is quicklyconsumed in a burst of star formation. In the presence of strong supernovae(SN) feedback, we observe the formation of a galactic fountain that regulatesstar formation over a longer period, but without halting it. If only AGNfeedback is considered, as soon as the SMBH reaches a critical mass, strongoutflows of hot gas are launched and prevent the cooling halo gas from reachingthe disk, thus efficiently halting star formation, leading to the so-called"quenching". If both feedback mechanisms act in tandem, we observe a non-linearcoupling, in the sense that the dense gas in the supernovae-powered galacticfountain is propelled by the hot outflow powered by the AGN at much largerradii than without AGN. We argue that these particular outflows are able tounbind dense gas from the galactic halo, thanks to the combined effect of SNand AGN feedback. We speculate that this mechanism occurs at the end of thefast growing phase of SMBH, and is at the origin of the dense molecularoutflows observed in many massive high-redshift galaxies.

The combined effect of AGN and supernovae feedback in launching massive molecular outflows in high-redshift galaxies