Where Do Obscured AGN Fit in A Galaxy's Timeline?
  Many X-ray bright active galactic nuclei (AGN) are predicted to follow an
extended stage of obscured black hole growth. In support of this picture we
examine the X-ray undetected AGNs in the COSMOS field and compare their host
galaxies with X-ray bright AGNs. We examine galaxies with
M_\ast>10^{9.5}M_\odot for the presence of AGNs at redshifts $z=0.5-3$. We
select AGNs in the infrared using \textit{Spitzer} and \textit{Herschel}
detections and use color selection techniques to select AGNs within strongly
star forming hosts. We stack \textit{Chandra} X-ray data of galaxies with an IR
detection but lacking an X-ray detection to obtain soft and hard fluxes,
allowing us to measure the energetics of these AGNs. We find a clear
correlation between X-ray luminosity and IR AGN luminosity in the stacked
galaxies. We also find that X-ray undetected AGNs all lie on the main sequence
-- the tight correlation between SFR and $M_\ast$ that holds for the majority
of galaxies, regardless of mass or redshift. This work demonstrates that there
is a higher population of obscured AGNs than previously thought.
