Radiative transfer inside clumpy media - The penetration of UV photons inside molecular clouds

Details Radiative transfer inside clumpy media - The penetration of UV photons inside molecular clouds Radiative transfer inside clumpy media - The penetration of UV photons inside molecular clouds

Feb 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...228..483b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 228, no. 2, Feb. 1990, p. 483-502.

Astronomy and Astrophysics

Astrophysics

155

Interstellar Extinction, Molecular Clouds, Radiative Transfer, Ultraviolet Radiation, Markov Processes, Mass Distribution, Radiation Transport

Scientific paper

The effects of clumpiness on the penetration of starlight inside interstellar (atomic or molecular hydrogen) clouds are studied by employing radiative transfer computations. Two different methods are considered: one involving a two-valued Markov stochastic process and the other consisting of a Monte Carlo simulation. The results representing these two methods are arranged in sequences along which the average opacity and the albedo remain constant while only one or two of the parameters vary at a time. Attention is given to variations of the cloud-intercloud density contrast, collapse of clumps enclosing a fixed mass function, and radiation filed versus depth in the layer. It is concluded that analytical computations based on the Markov process indicate that, in the presence of multiple scattering, average intensities can be obtained as solutions of a pair of coupled integral equations, while the Monte Carlo experiments allow more general assumptions regarding dust properties, overall cloud geometry, and illuminating conditions to be investigated.

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