Observations of CO emission from diffuse interstellar clouds

Details Observations of CO emission from diffuse interstellar clouds Observations of CO emission from diffuse interstellar clouds

Nov 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...209..782k&link_type=abstract

Astrophysical Journal, vol. 209, Nov. 1, 1976, pt. 1, p. 782-792. Research supported by the Aerospace Corporate Programs for Re

Astronomy and Astrophysics

Astrophysics

53

Carbon Monoxide, Emission Spectra, Interstellar Gas, Molecular Spectra, Gas Density, Gravitational Effects, Millimeter Waves, Stellar Evolution

Scientific paper

The paper reports measurements of, and upper limits for, millimeter-wavelength CO emission from interstellar clouds which have previously been studied via optical absorption lines. Along with CO measurements made by the Copernicus satellite, the results can be used to place constraints on models for interstellar chemistry. The present results are roughly consistent with models in which CO is produced by gas-phase reactions, and evidence is found to support calculations that a necessary but not sufficient condition for detecting the millimeter-wavelength CO lines is that the total gas density be greater than about 1000 per cu cm. Some of the clouds observed appear to be nearly self-gravitating and may therefore be in the very first stages of star formation.

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