# Searching for Trans Ethyl Methyl Ether in Orion KL

3 FORMATION STELLAIRE 2015
LAB - Laboratoire d'Astrophysique de Bordeaux [Pessac], UB - Université de Bordeaux, INSU - CNRS - Institut national des sciences de l'Univers , CNRS - Centre National de la Recherche Scientifique
Abstract : We report on the tentative detection of $trans$ Ethyl Methyl Ether (tEME), $t-CH_3CH_2OCH_3$, through the identification of a large number of rotational lines from each one of the spin states of the molecule towards Orion KL. We also search for $gauche$-$trans$-n-propanol, $Gt-n-CH_3CH_2CH_2OH$, an isomer of tEME in the same source. We have identified lines of both species in the IRAM 30m line survey and in the ALMA Science Verification data. We have obtained ALMA maps to establish the spatial distribution of these species. Whereas tEME mainly arises from the compact ridge component of Orion, Gt-n-propanol appears at the emission peak of ethanol (south hot core). The derived column densities of these species at the location of their emission peaks are $\leq(4.0\pm0.8)\times10^{15} cm^{-2}$ and $\leq(1.0\pm0.2)\times10^{15} cm^{-2}$ for tEME and Gt-n-propanol, respectively. The rotational temperature is $\sim100 K$ for both molecules. We also provide maps of $CH_3OCOH$, $CH_3CH_2OCOH$, $CH_3OCH_3$, $CH_3OH$, and $CH_3CH_2OH$ to compare the distribution of these organic saturated O-bearing species containing methyl and ethyl groups in this region. Abundance ratios of related species and upper limits to the abundances of non-detected ethers are provided. We derive an abundance ratio $N(CH_3OCH_3)/N(tEME)\geq150$ in the compact ridge of Orion.
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Astronomy and Astrophysics - A&A, EDP Sciences, 2015, 582, pp.1-39. 〈10.1051/0004-6361/201526255〉

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https://hal.archives-ouvertes.fr/hal-01197453
Contributeur : Marie-Paule Pomies <>
Soumis le : mardi 22 mars 2016 - 15:18:35
Dernière modification le : mercredi 16 mai 2018 - 11:24:01
Document(s) archivé(s) le : lundi 14 novembre 2016 - 01:44:17

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B., Tercero, J., Cernicharo, A., López, N. Brouillet, L., Kolesniková, et al.. Searching for Trans Ethyl Methyl Ether in Orion KL. Astronomy and Astrophysics - A&A, EDP Sciences, 2015, 582, pp.1-39. 〈10.1051/0004-6361/201526255〉. 〈hal-01197453〉

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