Tracing the evolution of Active Galactic Nuclei host galaxies over the
  last 9 Gyrs of Cosmic time
  We present the results of a combined galaxy population analysis for the host
galaxies of active galactic nuclei (AGN) identified at 0 < z < 1.4 within the
SDSS, Bootes and DEEP2 surveys. We identified AGN in a uniform and unbiased
manner at X-ray, infrared and radio wavelengths. Supermassive black holes
undergoing radiatively-efficient accretion (detected as X-ray and/or infrared
AGN) appear to be hosted in a separate and distinct galaxy population than AGN
undergoing powerful mechanically dominated accretion (radio AGN). Consistent
with some previous studies, radiatively efficient AGN appear to be
preferentially hosted in modest star-forming galaxies, with little dependence
on AGN or galaxy luminosity. AGN exhibiting radio-emitting jets due to
mechanically-dominated accretion are almost exclusively observed in massive,
passive galaxies. Crucially, we now provide strong evidence that the observed
host-galaxy trends are independent of redshift. In particular, these different
accretion-mode AGN have remained as separate galaxy populations throughout the
last 9 Gyr. Furthermore, it appears that galaxies hosting AGN have evolved
along the same path as galaxies that are not hosting AGN with little evidence
for distinctly separate evolution.
