Understanding mechanical feedback from HERGs and LERGs
  The properties of $\sim 1000$ high-excitation and low-excitation radio
galaxies (HERGs and LERGs) selected from the Heywood et al. (2016) $1 - 2$ GHz
VLA survey of Stripe 82 are investigated. The HERGs in this sample are
generally found in host galaxies with younger stellar populations than LERGs,
consistent with other work. The HERGs tend to accrete at a faster rate than the
LERGs, but there is more overlap in the accretion rates of the two classes than
has been found previously. We find evidence that mechanical feedback may be
significantly underestimated in hydrodynamical simulations of galaxy evolution;
84 % of this sample release more than 10 % of their energy in mechanical form.
Mechanical feedback is significant for many of the HERGs in this sample as well
as the LERGs; nearly 50 % of the HERGs release more than 10 % of their energy
in their radio jets.
