Cosmic ray feedback in galaxies and cool core clusters

Understanding the physics of galaxy formation is arguably among the greatest problems in modern astrophysics Recent cosmological simulations have demonstrated that feedback by star formation supernovae and active galactic nuclei appears to be critical in obtaining realistic disk galaxies to slow down star formation to the small observed rates to move gas and metals out of galaxies into the intergalactic medium and to balance radiative cooling of the low entropy gas at the centers of