J = 4-3 HCN observations of M17 SW, DR 21/OH/, W51 and NGC 6334

Details J = 4-3 HCN observations of M17 SW, DR 21/OH/, W51 and NGC 6334 J = 4-3 HCN observations of M17 SW, DR 21/OH/, W51 and NGC 6334

Apr 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.199..375w&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 199, Apr. 1982, p. 375-383. Research supported by the Science Research

Astronomy and Astrophysics

Astronomy

12

Abundance, Electron Transitions, Gas Density, Hydrocyanic Acid, Hydrogen Clouds, Molecular Clouds, Molecular Spectra, Astronomical Models, Bolometers, Carbon, Cosmochemistry, Hydrogen, Hyperfine Structure, Line Spectra, Molecular Collisions, Molecular Excitation, Nitrogen

Scientific paper

We report observations of NGC 6334N, Ml7 5W, W 51 and DR2l(OH) in the J = 4→3 transition of HCN at 354GHz. These results are combined with previously obtained J=1→0HCN data to determine molecular abundances X(HCN) ˜4 × 10-11 -4 × 10-12, and characteristic line excitation zone densities n(H2)˜106 cm-3. These results are at variance with previous analyses based on J=1→0 results alone, and the predictions of certain models of the cloud chemistry. The reasons for these discrepancies are discussed.

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