13c-methyl formate In Orion-kl: Alma observations and spectroscopic characterization

Favre, Cécile

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https://hdl.handle.net/2142/50995 Copy

Description

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

Issue Date

2014-06-17

Keyword(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.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

English

Permalink

http://hdl.handle.net/2142/50995

DOI

https://doi.org/10.15278/isms.2014.TF06

Copyright and License Information

Copyright 2014 by the authors. Licensed under a Creative Commons Attribution 4.0 International License. http://creativecommons.org/licenses/by/4.0/

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