An Efficient Monte Carlo Algorithm for a Restricted Class of Scattering Problems in Radiation Transfer

Details An Efficient Monte Carlo Algorithm for a Restricted Class of Scattering Problems in Radiation Transfer An Efficient Monte Carlo Algorithm for a Restricted Class of Scattering Problems in Radiation Transfer

2001-08-29

arxiv.org/abs/astro-ph/0108475v2

Astronomy and Astrophysics

Astrophysics

Accepted for publication in RMAA; 16 pages; 3 figures

Scientific paper

We describe an efficient Monte Carlo algorithm for a restricted class of scattering problems in radiation transfer. This class includes many astrophysically interesting problems, including the scattering of ultraviolet and visible light by grains. The algorithm correctly accounts for multiply-scattered light. We describe the algorithm, present a number of important optimizations, and explicity show how the algorithm can be used to estimate quantities such as the emergent and mean intensity. We present two test cases, examine the importance of the optimizations, and show that this algorithm can be usefully applied to optically-thin problems, a regime sometimes considered limited to explicit single-scattering plus attenuation approximations.

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