Quasar outflows at $z\ge 6$: the impact on the host galaxies

Abstract

We investigate quasar outflows at $z\ge 6$ by performing zoom-in cosmological hydrodynamical simulations. By employing the SPH code GADGET-3, we zoom in the $2R_{200}$ region around a $2\times 10^{12}{M}_{\odot }$ halo at $z=6$, inside a $(500\mathrm{Mpc}{)}^3$ comoving volume. We compare the results of our AGN runs with a control simulation in which only stellar/SN feedback is considered. Seeding $10^5{M}_{\odot }$ BHs at the centers of $10^9{M}_{\odot }$ halos, we find the following results. BHs accrete gas at the Eddington rate over $z=9-6$. At $z=6$, our most-massive BH has grown to $M_{\mathrm{BH}}=4\times 10^9{M}_{\odot }$. Fast ($v_r>1000$ km/s), powerful (${\dot{M}}_{\mathrm{out}}\sim 2000M_{\odot }$/yr) outflows of shock-heated low-density gas form at $z\sim 7$, and propagate up to hundreds kpc. Star-formation is quenched over $z=8-6$, and the total SFR (SFR surface density near the galaxy center) is reduced by a factor of $5$ ($1000$). We analyse the relative contribution of multiple physical process: (i) disrupting cosmic filamentary cold gas inflows, (ii) reducing central gas density, (iii) ejecting gas outside the galaxy; and find that AGN feedback has the following effects at $z=6$. The inflowing gas mass fraction is reduced by $\sim 12\%$, the high-density gas fraction is lowered by $\sim 13\%$, and $\sim 20\%$ of the gas outflows at a speed larger than the escape velocity ($500$ km/s). We conclude that quasar-host galaxies at $z\ge 6$ are accreting non-negligible amount of cosmic gas, nevertheless AGN feedback quenches their star formation dominantly by powerful outflows ejecting gas out of the host galaxy halo.

arXiv comment17 pages (excluding references and appendix), 11 figures, Submitted

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