How to keep massive galaxies quenched and remained "red and dead" over a large portion of cosmic time?
CR jets require less fine tuning
1. Moderate jet energy flux Enough energy for cocoon expansion to balance gas cooling, but not so much energy as to exceed escape velocity at Rcool.
2. Long cooling time within jet cocoon Longer than time to reach Rcool. Can be achieved by thermal or kinetic jets with high specific energy or CR jets.
3. Wide jet cocoon Width of cocoon at Rcool is enough to suppress the cooling flow over a wide solid angle. Can be achieved by jets with a high non-kinetic component, very light kinetic jets, or jets with initially wide angles.
Stellar feedback has the dominating effects
Stellar feedback strongly alters the amplification and morphology of galactic magnetic fields
Individual Supernovae, Hypernovae, and IMF Sampling in Dwarf Galaxies