Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...234..469c&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 234, no. 1-2, Aug. 1990, p. 469-486.
Astronomy and Astrophysics
Astrophysics
131
Carbon Monoxide, Interstellar Gas, Molecular Clouds, Orion Nebula, Astronomical Spectroscopy, Density Distribution, Electron Transitions, Ionized Gases, Radiative Transfer, Temperature Distribution
Scientific paper
An analysis of the physical conditions in a region of the Orion A molecular cloud is presented. Based on a multitransition study of CO and its isotopes, the analysis uses the large-velocity-gradient method to determine the cloud parameters. It is found that the inclusion of radiative coupling or different collision rate coefficients does not affect the derived cloud structure as significantly as the inclusion of kinetic temperature gradients, and that reasonable density distributions can be obtained only when the kinetic temperature is modeled to have large gradients along the line-of-sight. It is found that (C-12)O is of no use as a kinetic temperature indicator over most of the volume and mass of the Orion A molecular cloud, and the (C-13)O lines seem to be a relatively good tracer of total gas column density along the line-of-sight.
Bally John
Castets Alain
Dutrey Anne
Duvert Gilles
Langer William D.
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