Mass, Metal, and Energy Feedback in Cosmological Simulations

Understand

Using Gadget-2 cosmological hydrodynamic simulations including an observationally-constrained model for galactic outflows, we investigate how feedback from star formation distributes mass, metals, and energy on cosmic scales from z=6->0.

• We include instantaneous enrichment from Type II SNe, delayed enrichment from Type Ia SNe and stellar (AGB) mass loss, and we individually track C, O, Si, and Fe.
• Following on the successes of the momentum-driven wind scalings, we improve our implementation with an on-the-fly galaxy finder to derive wind properties based on host galaxy masses.
• By tracking wind particles in a suite of simulations, we find: (1) Wind material reaccretes onto a galaxy on a recycling timescale that varies inversely with galaxy mass.