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- W1925794029 abstract "Hydrodynamical simulations of galaxy formation such as the Illustris simulations have progressed to a state where they approximately reproduce the observed stellar mass function from high to low redshift. This in principle allows self-consistent models of reionization that exploit the accurate representation of the diffuse gas distribution together with the realistic growth of galaxies provided by these simulations, within a representative cosmological volume. In this work, we apply and compare two radiative transfer algorithms implemented in a GPU-accelerated code to the $106.5,{rm Mpc}$ wide volume of Illustris in postprocessing in order to investigate the reionization transition predicted by this model. We find that the first generation of galaxies formed by Illustris is just about able to reionize the universe by redshift $zsim 7$, provided quite optimistic assumptions about the escape fraction and the resolution limitations are made. Our most optimistic model finds an optical depth of $tausimeq 0.065$, which is in very good agreement with recent Planck 2015 determinations. Furthermore, we show that moment-based approaches for radiative transfer with the M1 closure give broadly consistent results with our angular-resolved radiative transfer scheme. In our favoured fiducial model, 20% of the hydrogen is reionized by redshift $z=9.20$, and this rapidly climbs to 80% by redshift $z=6.92$. It then takes until $z=6.24$ before 99% of the hydrogen is ionized. On average, reionization proceeds `inside-out' in our models, with a size distribution of reionized bubbles that progressively features regions of ever larger size while the abundance of small bubbles stays fairly constant." @default.
- W1925794029 created "2016-06-24" @default.
- W1925794029 creator A5004531924 @default.
- W1925794029 creator A5005759342 @default.
- W1925794029 creator A5023087030 @default.
- W1925794029 creator A5034385563 @default.
- W1925794029 creator A5036902588 @default.
- W1925794029 creator A5081711451 @default.
- W1925794029 creator A5085246344 @default.
- W1925794029 creator A5090587800 @default.
- W1925794029 date "2015-09-09" @default.
- W1925794029 modified "2023-10-17" @default.
- W1925794029 title "Hydrogen reionization in the Illustris universe" @default.
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