Black Hole Mass and Bulge Luminosity for Low-mass Black Holes
  We study the scaling between bulge magnitude and central black hole (BH) mass
in galaxies with virial BH masses < 10^6 solar mass. Based on careful image
decomposition of a snapshot Hubble Space Telescope I-band survey, we found that
these BHs are found predominantly in galaxies with pseudobulges. Here we show
that the \mbulge\ relation for the pseudobulges at low mass is significantly
different from classical bulges with BH masses >10^7 solar mass. Specfically,
bulges span a much wider range of bulge luminosity, and on average the
luminosity is larger, at fixed black hole mass. The trend holds both for the
active galaxies from Bentz et al. and the inactive sample of Gultekin et al.
and cannot be explained by differences in stellar populations, as it persists
when we use dynamical bulge masses. Put another way, the ratio between bulge
and BH mass is much larger than $\sim 1000$ for our sample. This is consistent
with recent suggestions that black hole mass does not scale with the
pseudobulge luminosity. The low-mass scaling relations appear to flatten,
consistent with predictions from Volonteri & Natarajan for massive seed BHs.
