Dark Matter Annihilation Feedback in cosmological simulations I: Code convergence and idealised halos

Understand

We describe and test a novel Dark Matter Annihilation Feedback (DMAF) scheme that has been implemented into the well known cosmological simulation code \textsf{GADGET-2}.

• In the models considered here, dark matter can undergo self-annihilation/decay into radiation and baryons.
• These products deposit energy into the surrounding gas particles and then the dark matter/baryon fluid is self-consistently evolved under gravity and hydrodynamics.
• We present tests of this new feedback implementation in the case of idealised dark matter halos with gas components for a range of halo masses, concentrations and annihilation rates.