The First Supernova Explosions in the Universe

Details The First Supernova Explosions in the Universe The First Supernova Explosions in the Universe

2003-05-19

arxiv.org/abs/astro-ph/0305333v3

Astrophys.J.596:L135-L138,2003

Astronomy and Astrophysics

Astrophysics

Published in ApJ Letters

Scientific paper

10.1086/379359

We investigate the supernova explosions that end the lives of massive Population III stars in low-mass minihalos (M~10^6 M_sun) at redshifts z~20. Employing the smoothed particle hydrodynamics method, we carry out numerical simulations in a cosmological set-up of pair-instability supernovae with explosion energies of E_SN=10^51 and 10^53 ergs. We find that the more energetic explosion leads to the complete disruption of the gas in the minihalo, whereas the lower explosion energy leaves much of the halo intact. The higher energy supernova expels > 90% of the stellar metals into a region ~1 kpc across over a timescale of 3-5 Myr. Due to this burst-like initial star formation episode, a large fraction of the universe could have been endowed with a metallicity floor, Z_min>10^-4 Z_sun, already at z>15.

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