A Monte Carlo approach to non-LTE radiative transfer problems

Details A Monte Carlo approach to non-LTE radiative transfer problems A Monte Carlo approach to non-LTE radiative transfer problems

Mar 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....73...67b&link_type=abstract

Astronomy and Astrophysics, vol. 73, no. 1-2, Mar. 1979, p. 67-73. Research supported by the Statens Naturvetenskapliga Forskni

Astronomy and Astrophysics

Astrophysics

129

Carbon Monoxide, Interstellar Gas, Monte Carlo Method, Nonequilibrium Thermodynamics, Radiative Transfer, Run Time (Computers), Gravitational Collapse, Line Shape, Molecular Spectra

Scientific paper

A procedure for the solution of non-LTE multilevel radiative-transfer problems using the Monte Carlo method is developed and shown to be useful. This procedure allows the inclusion of velocity fields, inhomogeneities, and complex geometries. It is applied to a study of the transfer of CO line radiation in a model of a spherical collapsing dark cloud. A technique for reducing the random fluctuations inherent in the Monte Carlo method is introduced. This technique typically reduces computing times by an order of magnitude in the investigated case. Line profiles accurate to 1% or better were obtained with a very reasonable amount of computing time.

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