Lyman alpha Radiative Transfer in Cosmological Simulations using Adaptive Mesh Refinement

Details Lyman alpha Radiative Transfer in Cosmological Simulations using Adaptive Mesh Refinement Lyman alpha Radiative Transfer in Cosmological Simulations using Adaptive Mesh Refinement

2008-05-21

arxiv.org/abs/0805.3153v2

Astrophys.J.696:853-869,2009; Erratum-ibid.702:824,2009

Astronomy and Astrophysics

Astrophysics

Minor corrections to match version published in ApJ, plus one typo concerning erroneously swapped "<" and ">" immediately afte

Scientific paper

10.1088/0004-637X/696/1/853 10.1

A numerical code for solving various Lyman alpha (Lya) radiative transfer (RT) problems is presented. The code is suitable for an arbitrary, three-dimensional distribution of Lya emissivity, gas temperature, density, and velocity field. Capable of handling Lya RT in an adaptively refined grid-based structure, it enables detailed investigation of the effects of clumpiness of the interstellar (or intergalactic) medium. The code is tested against various geometrically and physically idealized configurations for which analytical solutions exist, and subsequently applied to three "Lyman-break galaxies", extracted from high-resolution cosmological simulations at redshift z = 3.6. Proper treatment of the Lya scattering reveals a diversity of surface brightness (SB) and line profiles. Specifically, for a given galaxy the maximum observed SB can vary by an order of magnitude, and the total flux by a factor of 3 - 6, depending on the viewing angle. This may provide an explanation for differences in observed properties of high-redshift galaxies, and in particular a possible physical link between Lyman-break galaxies and regular Lya emitters.

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