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

作者：Aubert Dominique^*; Teyssier Romain

来源：Monthly Notices of the Royal Astronomical Society, 2008, 387(1): 295-307.

DOI：10.1111/j.1365-2966.2008.13223.x

• radiative transfer
• methods : numerical
• methods : N-body simulations

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.

• 出版日期2008-6-11
• 单位中国地震局