Abstract
We present the first quantified, statistical map of broad-line active
galactic nucleus (AGN) frequency with host galaxy color and stellar mass in
nearby (0.01 < z < 0.11) galaxies. Aperture photometry and z-band concentration
measurements from the Sloan Digital Sky Survey (SDSS) are used to dis- entangle
AGN and galaxy emission, resulting in estimates of uncontaminated galaxy
rest-frame color, luminosity, and stellar mass. Broad-line AGNs are distributed
throughout the blue cloud and green valley at a given stellar mass, and are
much rarer in quiescent (red sequence) galaxies. This is in contrast to the
published host galaxy properties of weaker narrow-line AGNs, indicating that
broad-line AGNs occur during a different phase in galaxy evolution. More
luminous broad-line AGNs have bluer host galaxies, even at fixed mass,
suggesting that the same processes that fuel nuclear activity also efficiently
form stars. The data favor processes that simultaneously fuel both star
formation activity and rapid supermassive black hole accretion. If AGNs cause
feedback on their host galaxies in the nearby universe, the evidence of
galaxy-wide quenching must be delayed until after the broad-line AGN phase.
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