White, Glenn J.; Phillips, J. P.; Beckman, J. E. and Cronin, N. J.
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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 Article|
|Copyright Holders:||1982 Royal Astronomical Society|
|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/Department:||Science > Physical Sciences
|Interdisciplinary Research Centre:||Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)|
|Depositing User:||G. J. White|
|Date Deposited:||06 Jun 2012 13:46|
|Last Modified:||26 Feb 2016 13:28|
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