Black Hole - Galaxy Scaling Relationships for Active Galactic Nuclei
  with Reverberation Masses
  We have utilized high-resolution optical Hubble Space Telescope images and
deep, ground-based near-infrared images to examine the host-galaxies of 37
active galactic nuclei with reverberation-based black hole masses. Using
two-dimensional image decompositions, we have separated the host galaxy from
the bright central AGN, allowing a re-examination of the MBH-Lbulge and
MBH-Lgalaxy relationships and the MBH-Mbulge and MBH-Mstars relationships using
V-H color to constrain the stellar mass-to-light ratio. We find clear
correlations for all of these scaling relationships, and the best-fit
correlations are generally in good agreement with the sample of early-type
galaxies with MBH from dynamical modeling and the sample of megamasers. We also
find good agreement with the expectations from the Illustris simulations,
although the agreement with other simulations is less clear because of the
different black hole mass ranges that are probed. MBH-Lbulge is found to have
the least scatter, and is therefore the best predictor of MBH among the
relationships examined here. Large photometric surveys that rely on automated
analysis and forego bulge-to-disk decompositions will achieve more accurate MBH
predictions if they rely on MBH-Mstars rather than MBH-Lgalaxy. Finally, we
have examined MBH/Mstars and find a clear trend with black hole mass but not
galaxy mass. This same trend is also exhibited by galaxies with MBH from
dynamical modeling and megamaser galaxies, as well as simulated galaxies from
Illustris, rising from ~0.01% at 10^6 Msun to ~1.0% at 10^10 Msun. This scaling
should be taken into account when comparing galaxy samples that are not matched
in MBH.
