Mathematics – Logic
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20912904t&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #129.04; Bulletin of the American Astronomical Society,
Mathematics
Logic
Scientific paper
Cosmic reionization is one of the least understood epochs in the evolution of the universe, but the signatures in 21cm radiation from neutral hydrogen and in the KSZ effect from free electrons will provide powerful constraints on early star formation and cosmological parameters. Updated observations from SDSS and WMAP are consistent with a generic model of patchy reionization beginning as early as z 20 and ending about z 6. In order to study patchy reionization for different star formation histories, we have run several high-resolution N-body + radiative transfer simulations with up to 24 billion particles and 360^3 RT grid cells. The RT calculations utilized a new ray tracing algorithm in which the initially O(N^2) scaling is converted to O(N) as the radiation filling factor approaches unity in the limit of complete reionization. We demonstrate that the current observational constraints require a star formation history where both Pop III and Pop II stars are significant sources of photoionizing radiation. This work is partially supported through the NSF grant AST-0407176 and NASA grant NNG06GI09G.
Cen Renyue
Trac Hy
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