Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995stin...9530751w&link_type=abstract
Unknown
Astronomy and Astrophysics
Astronomy
Absorption Spectra, Abundance, Deuterium Compounds, Hydrogen, Interstellar Gas, Methane, Molecular Clouds, Molecular Gases, Orion Constellation, Radio Astronomy, Absorption Spectroscopy, Density (Mass/Volume), Density Distribution, Interstellar Chemistry, Mathematical Models, Radio Telescopes, Star Formation
Scientific paper
A search has been performed for interstellar CH3D via its J(K) = 1(0) - 0(0) transition at 230 GHz and its J(K) = 2(0) - l(0) and J(K) = 2(1) - 1(1) lines at 465 GHz using the NRAO 12 m and CSO 10 m telescopes towards Orion-KL. This search was done in conjunction with laboratory measurements of all three transitions of CH3D using mm/sub-mm direct absorption spectroscopy. The molecule was not detected down to a 3 sigma level of T(A) less than 0.05 K towards Orion, which suggests an upper limit to the CH3D column density of N less than 6 x 1018/sq cm in the hot core region and a fractional abundance (with respect to H2) of less than 6 x 10-6. These measurements suggest that the methane abundance in the Orion hot core is f less than 6 x 10-4, assuming D/H approximately 0.01. Such findings are in agreement with recent hot core chemical models, which suggest CH4/H2 approximately 10-4.
Apponi Aldo Joseph
Womack Maria
Ziurys Lucy M.
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