RT Journal Article
T1 13C—methyl formate : observations of a sample of high mass starforming regions including Orion—KL and spectroscopic characterization
A1 Favre, Cecile
A1 Carvajal Zaera, Miguel
A1 Field, David
A1 Jorgensen, Jes
A1 Bisschop, Suzanne
A1 Brouillet, Nathalie
A1 Despois, Didier
A1 Baudry, Alain
A1 Kleiner, Isabelle
A1 Bergin, Edwin
A1 Crockett, Nathan
A1 Neill, Justin
A1 Margules, Laurent
A1 Huet, Thérèse R.
A1 Demaison, Jean
AB We have surveyed a sample of massive star-forming regions located over a range of distances from the Galactic centre formethyl formate, HCOOCH3, and its isotopologues H13COOCH3 and HCOO13CH3. The observations were carried out with theAPEX telescope in the frequency range 283.4-287.4 GHz. Based on the APEX observations, we report tentative detections ofthe 13C-methyl formate isotopologue HCOO13CH3 towards the following four massive star-forming regions: Sgr B2(N-LMH),NGC 6334 IRS 1, W51 e2 and G19.61-0.23. In addition, we have used the 1 mm ALMA science verification observations ofOrion-KL and confirm the detection of the 13C-methyl formate species in Orion-KL and image its spatial distribution. Ouranalysis shows that the 12C/13C isotope ratio in methyl formate toward Orion-KL Compact Ridge and Hot Core-SWcomponents (68.4±10.1 and 71.4±7.8, respectively) are, for both the 13C-methyl formate isotopologues, commensurate with theaverage 12C/13C ratio of CO derived toward Orion-KL. Likewise, regarding the other sources, our results are consistent withthe 12C/13C in CO. We also report the spectroscopic characterization, which includes a complete partition function, of thecomplex H13COOCH3 and HCOO13CH3 species. New spectroscopic data for both isotopomers H13COOCH3 and HCOO13CH3,presented in this study, has made it possible to measure this fundamentally important isotope ratio in a large organicmolecule for the first time.
PB American Astronomical Society
SN 0067-0049
SN 1538-4365 (electrónico)
YR 2014
FD 2014
LK http://hdl.handle.net/10272/9065
UL http://hdl.handle.net/10272/9065
LA eng
NO Favre, C.,  Carvajal Zaera, M., Field, D., Jorgensen, J., Bisschop, S., Brouillet, N., Despois, D., Baudry, A., Kleiner, I., Bergin, E., Crockett, N., Neill, J., Margules, L., Huet, T., Demaison, J.: "13C—methyl formate : observations of a sample of high mass starforming regions including Orion—KL and spectroscopic characterization". Astrophysical Journal Supplemen (2014). ISSN 0067-0049
NO This work was supported by the National Science Foundation under grant 1008800. We are grateful to the Ministerio de Economia y Competitividad of Spain for the financial support through grant No. FIS2011-28738-C02-02 and to the French Government through grant No. ANR-08-BLAN-0054 and the French PCMI (Programme National de Physique Chimie du Milieu Interstellaire). This paper makes use of the following ALMA data: ADS/JAO. ALMA#2011.0.00009.SV.ALMAis a partnership of ESO (representing its member states), NSF (USA), and NINS (Japan), together with NRC (Canada) and NSC and ASIAA (Taiwan), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/NRAO, and NAOJ. C.F. thanks Dahbia Talbi, Eric Herbst, and Anthony Remijan for enlightening discussions. Finally, we thank the anonymous referee for helpful comments.
DS Repositorio Institucional de la Universidad de Huelva
RD 30 may 2026