Radiative transfer in clumpy and fractal media

Details Radiative transfer in clumpy and fractal media Radiative transfer in clumpy and fractal media

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aipc..408..370v&link_type=abstract

The ultraviolet universe at low and high redshift. AIP Conference Proceedings, Volume 408, pp. 370-374 (1997).

Mathematics

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Radiative Transfer, Scattering, Physical Properties

Scientific paper

A Monte Carlo model of radiative transfer in multi-phase dusty media is applied to the situation of stars and clumpy dust in a sphere or a disk. The distribution of escaping and absorbed photons are shown for a range of clump filling factors and densities. Analytical methods of approximating the escaping fraction of radiation, based on the Mega-Grains approach [4], are discussed. Comparison with the Monte Carlo results shows that the escape probability formulate provide a reasonable approximation of the escaping/absorbed fractions, for a wide range of parameters characterizing the clumpy dusty medium. A possibly more realistic model of the interstellar medium is one in which clouds have a hierarchical structure of denser and denser clumps within clumps [2], resulting in a fractal distribution of gas and dust. Monte Carlo simulations of radiative transfer in such multi-phase fractal media are compared with the two-phase clumpy case.

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