Other
Scientific paper
May 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.208...35m&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 208, May 1, 1984, p. 35-55. Research supported by the S
Other
99
Astronomical Models, Carbon Monoxide, Emission Spectra, Hydrogen Clouds, Molecular Clouds, Astronomical Spectroscopy, Isothermal Processes, Optical Thickness, Radiative Transfer, Thermodynamic Equilibrium
Scientific paper
The authors present observations of the J = 3 - 2 and J = 1 - 0 transitions of CO towards M17 SW. The results indicate that M17 SW is composed of separate fragments which are optically thick in 12CO but which do not fill the beam at velocities away from the line centre. The authors have developed a simple model for emission from an isothermal cloud composed of randomly moving fragments which are in LTE. By comparing model profiles with the observed profiles in 12CO and 13CO, it is found that typical fragments in M17 SW have τ ≅ 2 in the 1 - 0 transition of 13CO. This result is combined with dynamical arguments to derive estimates of the characteristic size, mass, and column density of the fragments in M17 SW.
Hills Richard E.
Martin Heath M.
Sanders David B.
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