Outflowing Galactic Winds in Post-starburst and AGN Host Galaxies at
  0.2<z<0.8
  We present Keck/LRIS-B spectra for a sample of ten AEGIS X-ray AGN host
galaxies and thirteen post-starburst galaxies from SDSS and DEEP2 at 0.2<z<0.8
in order to investigate the presence, properties, and influence of outflowing
galactic winds at intermediate redshifts. We focus on galaxies that either host
a low-luminosity AGN or have recently had their star formation quenched to test
whether these galaxies have winds of sufficient velocity to potentially clear
gas from the galaxy. We find, using absorption features of Fe II, Mg II, and Mg
I, that six of the ten (60%) X-ray AGN host galaxies and four of the thirteen
(31%) post-starburst galaxies have outflowing galactic winds, with typical
velocities of ~200 km/s. We additionally find that most of the galaxies in our
sample show line emission, possibly from the wind, in either Fe II* or Mg II. A
total of 100% of our X-ray AGN host sample (including four red sequence
galaxies) and 77% of our post-starburst sample has either blueshifted
absorption or line emission. Several K+A galaxies have small amounts of cool
gas absorption at the systemic velocity, indicating that not all of the cool
gas has been expelled. We conclude that while outflowing galactic winds are
common in both X-ray low-luminosity AGN host galaxies and post-starburst
galaxies at intermediate redshifts, the winds are likely driven by supernovae
(as opposed to AGN) and do not appear to have sufficiently high velocities to
quench star formation in these galaxies.
