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Title:13c-methyl formate In Orion-kl: Alma observations and spectroscopic characterization
Author(s):Favre, Cécile
Contributor(s):Demaison, Jean; Huet, T.R.; Margulès, L.; Kleiner, Isabelle; Baudry, Alain; Despois, Didier; Brouillet, Nathalie; Bisschop, Suzanne; Jørgensen, Jes; Crockett, Nathan; Neill, Justin; Bergin, Edwin; Field, David; Carvajal, Miguel
Subject(s):Mini-symposium: Astronomical Molecular Spectroscopy in the Age of ALMA
Abstract:Determination of elemental isotopic ratios is valuable for understanding the chemical evolution of interstellar material. Until now the $^{12}$C/$^{13}$C ratio has predominantly been measured in simple species such as CO, CN and H$_{2}$CO and, becomes larger with increasing distance from the Galactic Center. We have investigated the carbon isotopic ratio for methyl formate HCOOCH$_{3}$, and its isotopologues H$^{13}$COOCH$_{3}$ and HCOO$^{13}$CH$_{3}$ addressing the issue whether the $^{12}$C/$^{13}$C ratio is the same for both simple and large molecules. Using ALMA science verification observations of Orion-KL and the spectroscopic characterization of the complex H$^{13}$COOCH$_{3}$ and HCOO$^{13}$CH$_{3}$ species that we have performed, we have 1) confirmed the detection of the $^{13}$C-methyl formate species in Orion-KL and, 2) image for the first time their spatial distribution. I will present some of these results. In particular, our analysis shows that the $^{12}$C/$^{13}$C isotope ratio in methyl formate toward the Compact Ridge and Hot Core-SW components that are associated with Orion-KL are, for both the $^{13}$C-methyl formate isotopologues, commensurate with the well-known $^{12}$C/$^{13}$C ratio of the simple species CO. Our findings suggest that grain surface chemistry very likely prevails in the formation of methyl formate main and $^{13}$C isotopologues.
Issue Date:2014-06-17
Publisher:International Symposium on Molecular Spectroscopy
Citation Info:Favre, C.; Demaison, J.; Huet, T.R.; Margulès, L.; Kleiner, I.; Baudry, A.; Despois, D.; Brouillet, N.; Bisschop, S.; Jørgensen, J.; Crockett, N.; Neill, J.; Bergin, E.; Field, D.; Carvajal, M. 13C-METHYL FORMATE IN ORION-KL: ALMA OBSERVATIONS AND SPECTROSCOPIC CHARACTERIZATION. Proceedings of the International Symposium on Molecular Spectroscopy, Urbana, IL, June 16-21, 2014. DOI: 10.15278/isms.2014.TF06
Rights Information:Copyright 2014 by the authors. Licensed under a Creative Commons Attribution 4.0 International License.
Date Available in IDEALS:2014-09-17

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