The Black Hole - Bulge Mass Relation in Megamaser Host Galaxies
  We present HST images for nine megamaser disk galaxies with the primary goal
of studying photometric BH-galaxy scaling relations. The megamaser disks
provide the highest-precision extragalactic BH mass measurements, while our
high-resolution HST imaging affords us the opportunity to decompose the complex
nuclei of their late-type hosts in detail. Based on the morphologies and shapes
of the galaxy nuclei, we argue that most of these galaxies' central regions
contain secularly evolving components (pseudo-bulges), and in many cases we
photometrically identify co-existing "classical" bulge components as well.
Using these decompositions, we draw the following conclusions: (1) The
megamaser BH masses span two orders of magnitude ($10^6$ -- $10^8 M_\odot$)
while the stellar mass of their spiral host galaxies are all $\sim 10^{11}
M_\odot$ within a factor of three; (2) the BH masses at a given bulge mass or
total stellar mass in the megamaser host spiral galaxies tend to be lower than
expected, when compared to an extrapolation of the BH-bulge relation based on
early-type galaxies; (3) the observed large intrinsic scatter of BH masses in
the megamaser host galaxies raises the question of whether scaling relations
exist in spiral galaxies.
