Evidence for Wide-Spread AGN Driven Outflows in the Most Massive z~1-2
  Star Forming Galaxies
  In this paper we follow up on our previous detection of nuclear ionized
outflows in the most massive (log(M*/Msun) >= 10.9) z~1-3 star-forming galaxies
(Forster Schreiber et al.), by increasing the sample size by a factor of six
(to 44 galaxies above log(M*/Msun) >= 10.9) from a combination of the
SINS/zC-SINF, LUCI, GNIRS, and KMOS^3D spectroscopic surveys. We find a fairly
sharp onset of the incidence of broad nuclear emission (FWHM in the Ha, [NII],
and [SII] lines ~ 450-5300 km/s), with large [NII]/Ha ratios, above
log(M*/Msun) ~ 10.9, with about two thirds of the galaxies in this mass range
exhibiting this component. Broad nuclear components near and above the
Schechter mass are similarly prevalent above and below the main sequence of
star-forming galaxies, and at z~1 and ~2. The line ratios of the nuclear
component are fit by excitation from active galactic nuclei (AGN), or by a
combination of shocks and photoionization. The incidence of the most massive
galaxies with broad nuclear components is at least as large as that of AGNs
identified by X-ray, optical, infrared or radio indicators. The mass loading of
the nuclear outflows is near unity. Our findings provide compelling evidence
for powerful, high-duty cycle, AGN-driven outflows near the Schechter mass, and
acting across the peak of cosmic galaxy formation.
