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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URL:	http://adsabs.harvard.edu/full/1982MNRAS.201..357B
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Abstract

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 V_LSR 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:	Glenn White
Date Deposited:	07 Jun 2012 08:23
Last Modified:	07 Jun 2012 21:35
URI:	http://oro.open.ac.uk/id/eprint/33791

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