Carbon monoxide observations of 34 dust clouds

Details Carbon monoxide observations of 34 dust clouds Carbon monoxide observations of 34 dust clouds

Feb 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975aj.....80..101m&link_type=abstract

Astronomical Journal, vol. 80, Feb. 1975, p. 101-110.

Astronomy and Astrophysics

Astronomy

64

Carbon Monoxide, Cosmic Dust, Line Spectra, Molecular Rotation, Nebulae, Emission Spectra, Hydrogen Clouds, Interstellar Matter, Molecular Spectra, Radio Astronomy, Tables (Data)

Scientific paper

We have made observations in the J equals 1-0 rotational lines of 12C16O and 13C16O in the directions of 34 dust clouds. 12CO emission was detected from 26 of these dust clouds; no 12CO emission was seen in the directions away from dust clouds. The 12CO and 13CO profiles are presented for all the positions where we have observations of both lines. The CO excitation temperatures, column densities, and the 13CO optical depths are discussed; we conclude that, in most of the clouds we observed, the 13CO line probably has a moderate optical depth, and the neutral-particle density is probably smaller than that necessary to thermalize the J equals 0 and J equals 1 levels of CO collisionally. We have found that the CO emission is often enhanced near young stars embedded in dust clouds.

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