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- W3100895746 abstract "We study the topology of reionization using accurate three-dimensional radiative transfer calculations post-processed on outputs from cosmological hydrodynamic simulations. In our simulations, reionization begins in overdense regions and then ‘leaks’ directly into voids, with filaments reionizing last owing to their combination of a high recombination rate and low emissivity. This result depends on the uniquely biased emissivity field predicted by our prescriptions for star formation and feedback, which have previously been shown to account for a wide array of measurements of the post-reionization Universe. It is qualitatively robust to our choice of simulation volume, ionizing escape fraction and spatial resolution (in fact, it grows stronger at higher spatial resolution) even though the exact overlap redshift is sensitive to each of these. However, it weakens slightly as the escape fraction is increased owing to the reduced density contrast at higher redshift. We also explore whether our results are sensitive to commonly employed approximations such as using optically thin Eddington tensors or substantially altering the speed of light. Such approximations do not qualitatively change the topology of reionization. However, they can systematically shift the overlap redshift by up to Δz∼ 0.5, indicating that accurate radiative transfer is essential for computing reionization. Our model cannot simultaneously reproduce the observed optical depth to Thomson scattering and ionization rate per hydrogen atom at z= 6, which could owe to numerical effects and/or missing early sources of ionization." @default.
- W3100895746 created "2020-11-23" @default.
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- W3100895746 date "2009-12-01" @default.
- W3100895746 modified "2023-10-18" @default.
- W3100895746 title "The late reionization of filaments" @default.
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- W3100895746 doi "https://doi.org/10.1111/j.1365-2966.2009.15521.x" @default.
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