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.

DOI: https://doi.org/10.1093/mnras/201.2.357

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

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.

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