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Negative feedback from accreting supermassive black holes is regarded as akey ingredient in suppressing star formation and quenching massive galaxies.However, several models and observations suggest that black hole feedback mayhave a positive effect, triggering star formation by compressing interstellarmedium gas to higher densities. We investigate the dual role of black holefeedback using cosmological hydrodynamic simulations from the Feedback InRealistic Environments (FIRE) project, including a novel implementation ofhyper-refined accretion-disc winds. Focusing on a massive, star-forming galaxyat $z \sim 2$ ($M_{\rm halo} \sim 10^{12.5} \, {\rm M}_{\odot}$), we show thatstrong quasar winds with kinetic power $\sim$10$^{46}$ erg/s acting for$>$20$\,$Myr drive the formation of a central gas cavity and can dramaticallyreduce the star formation rate surface density across the galaxy disc. Thesuppression of star formation is primarily driven by reducing the amount of gasthat can become star-forming, compared to directly evacuating the pre-existingstar-forming gas reservoir (preventive feedback dominates over ejectivefeedback). Despite the global negative impact of quasar winds, we identifyseveral plausible signatures of local positive feedback, including: (1) spatialanti-correlation of wind-dominated regions and star-forming clumps, (2) higherlocal star formation efficiency in compressed gas near the edge of the cavity,and (3) increased local contribution of outflowing material to star formation.Stars forming under the presence of quasar winds tend to do so at larger radialdistances. Our results suggest that positive and negative AGN feedback cancoexist in galaxies, but local positive triggering of star formation plays aminor role in global galaxy growth.

Local positive feedback in the overall negative: the impact of quasar winds on star formation in the FIRE cosmological simulations