Large-Scale Simulations of Reionization

Details Large-Scale Simulations of Reionization Large-Scale Simulations of Reionization

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...20715704k&link_type=abstract

American Astronomical Society Meeting 207, #157.04; Bulletin of the American Astronomical Society, Vol. 37, p.1417

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We use cosmological simulations to explore the large-scale effects of reionization. Since reionization is a process that involves a large dynamic range - from galaxies to rare bright quasars - we need to be able to cover a significant volume of the universe in our simulation without losing the important small scale effects from galaxies. Here we have taken an approach that uses clumping factors derived from small scale simulations to approximate the radiative transfer on the sub-cell scales. Using this technique, we can cover a simulation size up to 1280 dim h-1 dim Mpc with 10 dim h-1 dim Mpc cells. This allows us to construct synthetic spectra of quasars similar to observed spectra of SDSS quasars at high redshifts and compare them to the observational data. These spectra can then be analyzed for HII region sizes, the presence of the Gunn-Peterson trough, and the Lyman-α forest.

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