An analytical method for computing optically thick line profiles.

Details An analytical method for computing optically thick line profiles. An analytical method for computing optically thick line profiles.

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26as..114..397c&link_type=abstract

Astronomy and Astrophysics Supplement, v.114, p.397

Astronomy and Astrophysics

Astrophysics

4

Interstellar Medium: Clouds, Interstellar Medium: Molecules, Radio Lines: Interstellar, Lines: Profiles, Methods: Analytical

Scientific paper

We present a simple-minded approach to the computation of line profiles in the limit of zero line width and infinite optical depth. The method is a generalisation of the model of Morris (1975). The line is assumed to arise from a spherical clump with a radial velocity field: both the expansion/collapse velocity and the excitation temperature of the emitting gas are described by a power law dependence on the clump radius. The computation turns out to be almost fully analytical. The model results are compared with profiles observed in the molecular environment surrounding ultracompact HII regions.

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