A mechanical supernova feedback model conserves energy via rest-frame momentum injection and conditional thermal switching, yielding converged star formation histories in dwarf galaxy simulations at two resolutions.
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X-ray AGN at intermediate redshifts live in dark matter halos of mass ~10^13 solar masses with no significant dependence on black hole mass, Eddington ratio or X-ray luminosity.
MIR diagnostics and X-ray stacking on 1104 X-ray-undetected AGNs in COSMOS identify 23 CT-AGN candidates at 2.1 percent of the sample, far below the ~30 percent expected from CXB synthesis models.
Redefining AGN fraction relative only to star-forming galaxies shows little dependence on environment in SDSS, supporting internal secular evolution as the main trigger.