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The effects of Lyman-limit systems on the evolution and observability of the epoch of reionization
Stockholm University, Faculty of Science, Department of Astronomy. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
Number of Authors: 4
2016 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 458, no 1, 135-150 p.Article in journal (Refereed) Published
Abstract [en]

We present the first large-scale, full radiative transfer simulations of the reionization of the intergalactic medium in the presence of Lyman-limit systems (LLSs). To illustrate the impact of LLS opacity, possibly missed by previous simulations, we add either a uniform or spatially varying hydrogen bound free opacity. This opacity, implemented as the mean free path (MFP) of the ionizing photons, extrapolates the observed, post-reionization redshift dependence into the epoch of reionization. In qualitative agreement with previous studies, we find that at late times the presence of LLSs slows down the ionization fronts, and alters the size distribution of H TT regions. We quantitatively characterize the size distribution and morphological evolution of H 11 regions and examine the effects of the LLSs on the redshifted 21-cm signal from the patchy reionization. The presence of LLSs extends the ionization history by Delta z similar to 0.8. The LLS absorbers significantly impede the late-time growth of the H u regions. The position dependent LLS distribution slows reionization further and additionally limits the late growth of the ionized regions. However, there is no 'freeze out' of the H II regions and the largest regions grow to the size of the simulation volume. The 21-cm power spectra show that at large scales the power drops by a factor of 2 for 50 per cent and 75 per cent ionization stages (at k = 0.1 hMp c(-1)) reflecting the limiting effect of the LLSs on the growth of ionized patches. The statistical observables such as the rms of the brightness temperature fluctuations and the peak amplitudes of the 21-cm power spectra at large scales (k = 0.05-0.1 hMp c(-1)) are diminished by the presence of LLS.

Place, publisher, year, edition, pages
2016. Vol. 458, no 1, 135-150 p.
Keyword [en]
radiative transfer, methods: numerical, HII regions, intergalactic medium, cosmology: theory
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-131218DOI: 10.1093/mnras/stw249ISI: 000374568900006OAI: oai:DiVA.org:su-131218DiVA: diva2:936721
Available from: 2016-06-14 Created: 2016-06-14 Last updated: 2016-06-14Bibliographically approved

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Mellema, Garrelt
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