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

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

2007-09-11

arxiv.org/abs/0709.1544v1

Astronomy and Astrophysics

Astrophysics

14 pages, 13 figures, submitted to MNRAS

Scientific paper

10.1111/j.1365-2966.2008.13223.x

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 photo-heating, ATON is able to reproduce the results of other schemes on a various set of standard tests such as the expansion of a HII 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.

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