Red Galaxies from Hot Halos in Cosmological Hydro Simulations
  I highlight three results from cosmological hydrodynamic simulations that
yield a realistic red sequence of galaxies: 1) Major galaxy mergers are not
responsible for shutting off star-formation and forming the red sequence.
Starvation in hot halos is. 2) Massive galaxies grow substantially (about a
factor of 2 in mass) after being quenched, primarily via minor (1:5) mergers.
3) Hot halo quenching naturally explains why galaxies are red when they either
(a) are massive or (b) live in dense environments.
