Detection of 13CO J=3-2 Emission from the Molecular Clouds OMG-1 and NGC2264

Details Detection of 13CO J=3-2 Emission from the Molecular Clouds OMG-1 and NGC2264 Detection of 13CO J=3-2 Emission from the Molecular Clouds OMG-1 and NGC2264

Mar 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...244..863h&link_type=abstract

Astrophysical Journal, Vol.244, P. 863, 1981

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Scientific paper

We have made the first measurements of the 330 GHz J =3-2 lines of 13CO in the molecular clouds OMC-l and NGC 2264. Simple velocity gradient calculations can give a consistent description of the intensities of these lines, together with the available CO (J =2-1) isotopic lines and the equivalent J = 1-0 transitions. They indicate fractional 13CO abundances similar to those found in dark clouds, but low values of the molecular hydrogen density, n(H2) 5 × 103 cm-3. The higher densities (˜105 cm-3) indicated by other molecular observations of these clouds suggest either the presence of high density fragments within the clouds or that the simple analysis is not appropriate for the CO lines, and more complex models are required to explain all the observations.

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