Galaxy-scale AGN Feedback - Theory
  Powerful relativistic jets in radio galaxies are capable of driving strong
outflows but also inducing star-formation by pressure-triggering collapse of
dense clouds. We review theoretical work on negative and positive active
galactic nuclei feedback, discussing insights gained from recent hydrodynamical
simulations of jet-driven feedback on galaxy scales that are applicable to
compact radio sources. The simulations show that the efficiency of feedback and
the relative importance of negative and positive feedback depends strongly on
interstellar medium properties, especially the column depth and spatial
distribution of clouds. Negative feedback is most effective if clouds are
distributed spherically and individual clouds have small column depths, while
positive feedback is most effective if clouds are predominantly in a disc-like
configuration.
