Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-10-09
Astrophys.J.555:92-106,2001
Astronomy and Astrophysics
Astrophysics
18 pages, 12 figures, emulateapj, revised version accepted for publication in the ApJ
Scientific paper
10.1086/321474
We assess supernova (SN)-driven pregalactic outflows as a mechanism for distributing the product of stellar nucleosynthesis over large cosmological volumes prior to the reionization epoch. SN ejecta will escape the grasp of halos with virial temperatures T_vir>10^{4.3} K (corresponding to masses M>10^8 h^{-1} M_sun at redshift z=9 when they collapse from 2-sigma fluctuations) if rapid cooling can take place, and a significant fraction of their baryonic mass is converted into stars over a dynamical timescale. We study the evolution of SN-driven bubbles as they blow out from subgalactic halos and propagate into the intergalactic medium (IGM), and show that to lift the halo gas out of the potential well the energy injection must continue at least until blow-away occurs. The collective explosive output of about ten thousands SNe per halo at these early epochs could pollute vast regions of intergalactic space to a mean metallicity
Ferrara Andrea
Madau Piero
Rees Martin J.
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