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Simulations of the reionization of the clumpy intergalactic medium with a novel particle-based two-moment radiative transfer scheme

Published online by Cambridge University Press:  20 January 2023

Tsang Keung Chan Open the ORCID record for Tsang Keung Chan [Opens in a new window] ,
Alejandro Benitez-Llambay ,
Tom Theuns  and
Carlos Frenk
Tsang Keung Chan
Affiliation:
Institute for Computational Cosmology, Durham University, South Road, Durham DH1 3LE, UK email: tsang.k.chan@durham.ac.uk Department of Physics, Durham University, South Road, Durham DH1 3LE, UK
Alejandro Benitez-Llambay
Affiliation:
Dipartimento di Fisica G. Occhialini, Università degli Studi di Milano Bicocca, Piazza della Scienza, 3 I-20126 Milano MI, Italy
Tom Theuns
Affiliation:
Institute for Computational Cosmology, Durham University, South Road, Durham DH1 3LE, UK email: tsang.k.chan@durham.ac.uk Department of Physics, Durham University, South Road, Durham DH1 3LE, UK
Carlos Frenk
Affiliation:
Institute for Computational Cosmology, Durham University, South Road, Durham DH1 3LE, UK email: tsang.k.chan@durham.ac.uk Department of Physics, Durham University, South Road, Durham DH1 3LE, UK
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Abstract

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The progress of cosmic reionization depends on the presence of over-dense regions that act as photon sinks. Such sinks may slow down ionization fronts as compared to a uniform intergalactic medium (IGM) by increasing the clumping factor. We present simulations of reionization in a clumpy IGM resolving even the smallest sinks. The simulations use a novel, spatially adaptive and efficient radiative transfer implementation in the SWIFT SPH code, based on the two-moment method. We find that photon sinks can increase the clumping factor by a factor of ∼10 during the first ∼100 Myrs after the passage of an ionization front. After this time, the clumping factor decreases as the smaller sinks photoevaporate. Altogether, photon sinks increase the number of photons required to reionize the Universe by a factor of η ∼2, as compared to the homogeneous case. The value of η also depends on the emissivity of the ionizing sources.

Keywords

radiative transfercosmology:early universegalaxies:intergalactic medium
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 16 , Symposium S362: The Predictive Power of Computational Astrophysics as a Discovery Tool , June 2020 , pp. 15 - 20
Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
© The Author(s), 2023. Published by Cambridge University Press on behalf of International Astronomical Union

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