Comparison of J = 2-1 and J = 1-0 spectra of CO in molecular clouds

Details Comparison of J = 2-1 and J = 1-0 spectra of CO in molecular clouds Comparison of J = 2-1 and J = 1-0 spectra of CO in molecular clouds

Apr 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...213l..41p&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 213, Apr. 1, 1977, p. L41-L45.

Other

17

Brightness Temperature, Carbon Monoxide, Interstellar Matter, Molecular Spectra, Spectral Line Width, Astronomical Models, Mean Free Path, Molecular Rotation, Spectrum Analysis, Temperature Profiles

Scientific paper

Results are reported for observations of the J = 2-1 and J = 1-0 rotational transitions of carbon monoxide in eight molecular clouds, including several dark clouds. For each of these eight sources, the 2-1 and 1-0 line profiles and intensities are strikingly similar. This similarity is predicted by cloud models in which the CO line widths are produced primarily by radial collapse or other large-scale motions within the clouds, but is not easily explained by models in which the line widths result from turbulence on a scale small compared with the photon mean free paths.

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