Momentum-driven Winds from Radiatively Efficient Black Hole Accretion
  and Their Impact on Galaxies
  We explore the effect of momentum-driven winds representing radiation
pressure driven outflows from accretion onto supermassive black holes in a set
of numerical hydrodynamical simulations. We explore two matched sets of
cosmological zoom-in runs of 24 halos with masses ~$10^{12.0}-10^{13.4}$ M_sun
run with two different feedback models. Our `NoAGN' model includes stellar
feedback via UV heating, stellar winds and supernovae, photoelectric heating
and cosmic X-ray background heating from a meta-galactic background. Our
fiducial `MrAGN' model is identical except that it also includes a model for
black hole seeding and accretion, as well as heating and momentum injection
associated with the radiation from black hole accretion. Our MrAGN model
launches galactic outflows which result in both `ejective' feedback - the
outflows themselves which drive gas out of galaxies - and `preventative'
feedback, which suppresses the inflow of new and recycling gas. As much as 80 %
of outflowing galactic gas can be expelled, and accretion can be suppressed by
as much as a factor of 30 in the MrAGN runs when compared with the NoAGN runs.
The histories of NoAGN galaxies are recycling-dominated, with ~70% of material
that leaves the galaxy eventually returning, and the majority of outflowing gas
re-accretes on 1 Gyr timescales without AGN feedback. Outflowing gas in the
MrAGN runs has higher characteristic velocity (500 - 1,000 km/s versus 100-300
km/s for outflowing NoAGN gas) and travels as far as a few Mpcs. Only ~10% of
ejected material is re-accreted in the MrAGN galaxies.
