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The properties of $\sim 1000$ high-excitation and low-excitation radiogalaxies (HERGs and LERGs) selected from the Heywood et al. (2016) $1 - 2$ GHzVLA survey of Stripe 82 are investigated. The HERGs in this sample aregenerally found in host galaxies with younger stellar populations than LERGs,consistent with other work. The HERGs tend to accrete at a faster rate than theLERGs, but there is more overlap in the accretion rates of the two classes thanhas been found previously. We find evidence that mechanical feedback may besignificantly 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 wellas the LERGs; nearly 50 % of the HERGs release more than 10 % of their energyin their radio jets.

Understanding mechanical feedback from HERGs and LERGs