Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...202...50d&link_type=abstract
Astrophysical Journal, vol. 202, Nov. 15, 1975, pt. 1, p. 50-57.
Astronomy and Astrophysics
Astrophysics
153
Carbon Monoxide, Cosmic Dust, Emission Spectra, Interstellar Matter, Nebulae, Astronomical Catalogs, Carbon 13, Formaldehyde, Interstellar Extinction, Line Spectra, Molecular Excitation, Vertical Distribution
Scientific paper
Results are reported of a CO and (C-13)O survey of 68 dark clouds from the Lynds catalog. CO was detected in 63 of the 64 sources in which it was searched for, and the (C-13)O line was seen in 52 of 55 clouds. There is a rather narrow distribution of CO peak line radiation temperatures about a mean of 6 K; this may reflect the presence of a roughly uniform kinetic temperature of 9.5 K in the sources. Despite the probably subthermal excitation temperature of the (C-13)O transition observed, derived (C-13)O column densities are most likely good to within a factor of 2. Typical CO column densities for the clouds surveyed are 5 x 10 to the 17-th power per sq cm, assuming a terrestrial carbon isotope ratio. All 68 clouds have previously been studied by Dieter in 6-cm H2CO absorption; a comparison of line widths shows the (C-13)O lines to generally be wider than their formaldehyde counterparts. Possible explanations of this fact in terms of internal cloud motions are discussed.
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