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First Stars III
Contact:
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Poster
Title:The First Supernova Explosions: Energetics, Feedback, and Chemical Enrichment Author(s): Thomas H. Greif Abstract: We perform three dimensional smoothed particle hydrodynamics (SPH) simulations in a realistic cosmological setting to investigate the expansion, feedback, and chemical enrichment properties of a 200 M_sun pair-instability supernova (PISN) in the high-redshift universe. To this end, we use the entropy-conserving formulation of the cosmological simulation code GADGET, and follow the evolution of the SN remnant until it effectively dissolves into the intergalactic medium (IGM). We find that the blast wave entirely disrupts the host halo and propagates for a Hubble time to a final mass-weighted mean shock radius of 2.5 kpc (proper), roughly half the size of the original HII region, and in this process sweeps up a total gas mass of 2.5*10^5 M_sun. The bulk of the shock enters the IGM, while a small fraction exerts positive mechanical feedback on neighbouring minihalos by shock-compressing their cores. Finally, the metal-rich interior expands adiabatically into the cavities created by the shock, and ultimately into the voids with a maximum extent similar to the final shock radius.
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