J = 4→3 HCN observations of M17SW, DR 21(OH), W51 and NGC 6334

White, Glenn J.; Phillips, J. P.; Beckman, J. E. and Cronin, N. J. (1982). J = 4→3 HCN observations of M17SW, DR 21(OH), W51 and NGC 6334. Monthly Notices of the Royal Astronomical Society, 199 pp. 375–383.

DOI: https://doi.org/10.1093/mnras/199.2.375

URL: http://adsabs.harvard.edu/full/1982MNRAS.199..375W

Abstract

We report observations of NGC 6334N, Ml7SW, 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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