Physics
Scientific paper
Aug 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982esasp.189...45p&link_type=abstract
In ESA The Sci. Importance of Submillimetre Observations p 45-49 (SEE N83-22034 11-88)
Physics
1
Electron Emission, Ground State, Molecular Clouds, Nebulae, Signal To Noise Ratios, Spontaneous Emission, Ultraviolet Radiation, Carbon, Plancks Constant, Spatial Distribution, Stellar Evolution, Telescopes, Time Dependence, Velocity Distribution
Scientific paper
Emission from the ground state fine structure transition of atomic carbon at 610 microns has been observed in Galactic sources. From comparison of the observations with CO emission, it can be deduced that the abundance of neutral carbon relative to CO is high (approximately 0.1-3). The spatial and velocity distribution of CI and CO are often very similar. If molecular clouds are older than 1 x 10 to the 6th power years, the observations necessitate a mechanism which can maintain a high abundance of neutral carbon in cloud material, either by hindering complete conversion of C into CO or by physically and chemically rejuvenating the material.
Keene Jocelyn
Phillips Thomas G.
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