Infrared Selection of Obscured Active Galactic Nuclei in the COSMOS
  Field
  We present a study of the connection between black hole accretion, star
formation, and galaxy morphology at z<=2.5. We focus on active galactic nuclei
(AGNs) selected by their mid-IR power-law emission. By fitting optical to
far-IR photometry with state-of-the-art spectral energy distribution (SED)
techniques, we derive stellar masses, star formation rates, dust properties,
and AGN contributions in galaxies over the whole COSMOS field. We find that
obscured AGNs lie within or slightly above the star-forming sequence. We
confirm our previous finding about compact host galaxies of obscured AGNs at
z~1, and find that galaxies with 20-50% AGN contributions tend to have smaller
sizes, by ~25-50%, compared to galaxies without AGNs. Furthermore, we find that
a high merger fraction of up to 0.5 is appropriate for the most luminous (log
(LIR/Lsun) ~ 12.5) AGN hosts and non-AGN galaxies, but not for the whole
obscured AGN sample. Moreover, merger fraction depends on the total and
star-forming infrared luminosity, rather than the decomposed AGN infrared
luminosity. Our results suggest that major mergers are not the main driver of
AGN activity, and therefore obscured AGNs might be triggered by internal
mechanisms, such as secular processes, disk instabilities, and compaction in a
particular evolutionary stage. We make the SED modeling results publicly
available.
