Hyperfine anomalies of HCN in cold dark clouds

Details Hyperfine anomalies of HCN in cold dark clouds Hyperfine anomalies of HCN in cold dark clouds

Jul 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...258l..75w&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 258, July 15, 1982, p. L75-L78.

Astronomy and Astrophysics

Astrophysics

33

Hydrocyanic Acid, Hyperfine Structure, Interstellar Matter, Line Spectra, Molecular Clouds, Astronomical Spectroscopy, Atomic Excitations, H Ii Regions, Low Temperature, Molecular Excitation, Spectral Line Width

Scientific paper

Observations of the J equals one to zero line of HCN measured toward six positions in nearby low-temperature clouds are reported. The measured relative intensities of the hyperfine components of the line are anomalous in that the F equals zero to one transition is stronger than would be expected if all three components had equal excitation temperatures. Differences of approximately 20 percent in the populations per sublevel of J equals one could account for the observations. The results are in contrast to the situation observed in warmer molecular clouds associated with H II regions where the F equals one to onyline is anomalously weak. The apparent overpopulation of J equals one, F equals zero in dark clouds may be related to the phenomenon observed in the J equals one to zero transitions of HCO(+) and HNC in the same objects where the C-13 substituted version of these species is found to be stronger than the C-12 species.

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