Jenny Greene
Intermediate-mass Black Holes in Active Galaxies
Greene & Ho (2004) presented the only uniformly-selected sample of
intermediate-mass (< 10^6 solar masses) BHs in Active Galactic Nuclei
(AGNs). This sample probes a new regime in BH mass, host-galaxy
morphology and AGN demographics. The sample also provides the only
observational constraints on the mass spectrum and spectral properties
of primordial seed BHs. Remarkably, the objects appear to obey the
M-sigma relation established locally for more massive systems,
suggesting physical continuity over many orders of magnitude in BH
mass. We discuss preliminary results on the host morphologies,
variability and spectral energy distributions (obtained with the VLA
and CHANDRA) of this unique sample of intermediate-mass BHs.