Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...260..579d&link_type=abstract
Astrophysical Journal, Part 1, vol. 260, Sept. 15, 1982, p. 579-583.
Astronomy and Astrophysics
Astrophysics
1
Carbon Monoxide, Interstellar Matter, Line Shape, Molecular Clouds, Molecular Spectra, Radiative Transfer, Electron Transitions, Frequency Distribution, Molecular Excitation, Temperature Gradients
Scientific paper
In order to simplify the radiative transfer calculation in a multilevel system, the assumption of complete redistribution of the frequency of a photon upon scattering is usually made. Here the validity of that assumption in calculating line profiles from molecular clouds is tested by replacing the assumption with an actual calculation of the radiative transfer in each part of the line. The emergent line profiles in the more elaborate calculation are found to differ only slightly from those obtained under the assumption of complete frequency redistribution, so that, indeed, that simplification is both useful and appropriate.
Deguchi Shigeki
Kwan Juliana
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