Why do Black Holes Trace Bulges (& Central Surface Densities), Instead of Galaxies as a Whole?

Philip F. Hopkins, Sarah Wellons, Daniel Angles-Alcazar +2

Previous studies of fueling black holes (BHs) in galactic nuclei have argued (on scales ~0.01-1000pc) accretion is dynamical with inflow rates $\dot{M}\simη\,M_{\rm gas}/t_{\rm dyn…