Journal Article

A radiative transfer scheme for cosmological reionization based on a local Eddington tensor

Dominique Aubert and Romain Teyssier

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 387, issue 1, pages 295-307
Published in print June 2008 | ISSN: 0035-8711
Published online May 2008 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2008.13223.x
A radiative transfer scheme for cosmological reionization based on a local Eddington tensor

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A radiative transfer scheme is presented, based on a moment description of the equation of radiative transfer and the so-called ‘M1 closure model’ for the Eddington tensor. This model features a strictly hyperbolic transport step for radiation: it has been implemented using standard Godunov-like techniques in a new code called aton. Coupled to simple models of ionization chemistry and photoheating, aton is able to reproduce the results of other schemes on a various set of standard tests such as the expansion of a H ii region, the shielding of the radiation by dense clumps and cosmological ionization by multiple sources. Being simple yet robust, such a scheme is intended to be naturally and easily included in grid-based cosmological fluid solvers.

Keywords: radiative transfer; methods: numerical; methods:N-body simulations

Journal Article.  8629 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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