Radiative Transfer in a Clumpy Medium - Part Two - the Mega-Grains Approximation for Two-Phase Models
Abstract
An approximate method is presented for describing the transfer of radiation inside a two-phase medium. The medium is assumed to consist of spherical clumps, with uniform size and density, embedded in a more tenuous interclump medium. The transfer of radiation is modelled by treating the clumps as large grains, or `megagrains', with absorption and scattering coefficients calculable from the properties of the dust grains of which the clumps are composed. Numerical examples, for various two-phase slabs, show that radiation intensities calculated in this way agree closely with those found by modelling the density variations as a two-state Markov process.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- September 1993
- DOI:
- 10.1093/mnras/264.1.161
- Bibcode:
- 1993MNRAS.264..161H
- Keywords:
-
- radiative transfer - scattering - ISM: clouds - dust;
- extinction