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Detection of the 2(1,1) - 2(1,2) rotational emission line of HDO in the Orion Molecular Cloud

Beckman, John E.; Watt, Graeme D.; White, Glenn J.; Phillips, J. Peter; Frost, Robin L. and Davis, John H. (1982). Detection of the 2(1,1) - 2(1,2) rotational emission line of HDO in the Orion Molecular Cloud. Monthly Notices of the Royal Astronomical Society, 201 pp. 357–364.

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The 2(1,1) - 2(1,2) rotational transition of HDO has been detected towards the KL position at the center of the OMC-1 at a velocity VLSR of +5.5(± 1.3)km s-1, corresponding to emission from the central core. This measurement is combined with previous estimates of the H2O abundance close to KL to obtain an [HDO]:[H2O] ratio of 9.5(±1.5) x 10-3. The systematic model-dependence of this ratio is examined in some detail, to show how reliably it may be used to obtain a radial gradient of [HDO]:[H2O], and hence of [D]:[H], within the Galaxy.

Item Type: Journal Article
Copyright Holders: 1982 Royal Astronomical Society
ISSN: 1365-2966
Keywords: deuterium; Lyman spectra; molecular clouds; Orion constellation; atomic energy levels; isotope effect
Academic Unit/Department: Science > Physical Sciences
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 33791
Depositing User: G. J. White
Date Deposited: 07 Jun 2012 08:23
Last Modified: 26 Feb 2016 13:28
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