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- W3103640476 abstract "We present a new method for modeling inhomogeneous cosmic reionization on large scales. Utilizing high-resolution radiation-hydrodynamic simulations with 20483 dark matter particles, 20483 gas cells, and 17 billion adaptive rays in a L = 100 Mpc h−1 box, we show that the density and reionization redshift fields are highly correlated on large scales (≳ 1 Mpc h−1). This correlation can be statistically represented by a scale-dependent linear bias. We construct a parametric function for the bias, which is then used to filter any large-scale density field to derive the corresponding spatially varying reionization redshift field. The parametric model has three free parameters that can be reduced to one free parameter when we fit the two bias parameters to simulation results. We can differentiate degenerate combinations of the bias parameters by combining results for the global ionization histories and correlation length between ionized regions. Unlike previous semi-analytic models, the evolution of the reionization redshift field in our model is directly compared cell by cell against simulations and performs well in all tests. Our model maps the high-resolution, intermediate-volume radiation-hydrodynamic simulations onto lower-resolution, larger-volume N-body simulations (≳ 2 Gpc h−1) in order to make mock observations and theoretical predictions." @default.
- W3103640476 created "2020-11-23" @default.
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- W3103640476 date "2013-10-01" @default.
- W3103640476 modified "2023-10-06" @default.
- W3103640476 title "REIONIZATION ON LARGE SCALES. I. A PARAMETRIC MODEL CONSTRUCTED FROM RADIATION-HYDRODYNAMIC SIMULATIONS" @default.
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- W3103640476 doi "https://doi.org/10.1088/0004-637x/776/2/81" @default.
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