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Title:
A Search for Interstellar CH 3: Limits to the Methane Abundance in Orion-KL
Authors:
Womack, Maria; Apponi, A. J.; Ziurys, L. M.
Publication:
Astrophysical Journal v.461, p.897 (ApJ Homepage)
Publication Date:
04/1996
Origin:
APJ
Astronomy Keywords:
ISM: ABUNDANCES, ISM: CLOUDS, ISM: INDIVIDUAL NAME: ORION KLEINMANN-LOW, ISM: MOLECULES, MOLECULAR PROCESSES
DOI:
10.1086/177110
Bibliographic Code:
1996ApJ...461..897W

Abstract

A search has been performed for interstellar CH3D via its JK = 10-00 transition at 232 GHz and its JK = 20-10 and JK = 21 -11 lines at 465 GHz using the NRAO 12 m and CSO 10 m telescopes toward Orion-KL. This search was done in conjunction with laboratory measurements of all three transitions of CH3D using millimeter/submillimeter direct absorption spectroscopy. The molecule was not detected down to a 3 σ level of TA* <0.05 K for the JK = 21-11 line toward Orion, which indicates an upper limit to the CH3D column density of N < 6 x 1018 cm-2 in the hot core region and a fractional abundance (with respect to H2) of <6 x 10-6. These measurements suggest that the methane abundance in the Orion hot core is f < 6 x 10-4, assuming D/H ˜ 0.01. Such findings are in agreement with recent hot core chemical models, which predict CH4/H2 ˜ 10-4.

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