Searching for Trans Ethyl Methyl Ether in Orion KL

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.
Type de document :
Article dans une revue
Astronomy and Astrophysics - A&A, EDP Sciences, 2015, 582, pp.1-39. 〈10.1051/0004-6361/201526255〉
Liste complète des métadonnées

Littérature citée [3 références]  Voir  Masquer  Télécharger

https://hal.archives-ouvertes.fr/hal-01197453
Contributeur : Marie-Paule Pomies <>
Soumis le : mardi 22 mars 2016 - 15:18:35
Dernière modification le : vendredi 13 octobre 2017 - 13:52:03
Document(s) archivé(s) le : lundi 14 novembre 2016 - 01:44:17

Fichier

Searching for Trans Ethyl Meth...
Fichiers produits par l'(les) auteur(s)

Identifiants

Collections

Citation

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〉

Partager

Métriques

Consultations de la notice

144

Téléchargements de fichiers

22