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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.

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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.

Item Type: Journal Item
Copyright Holders: 1982 Royal Astronomical Society
ISSN: 1365-2966
Keywords: 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
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 33796
Depositing User: G. J. White
Date Deposited: 06 Jun 2012 13:46
Last Modified: 29 Nov 2016 22:46
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