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Oxygen fractionation in dense molecular clouds

AuthorsLoison, J.C.; Wakelam, V.; Gratier, P.; Hickson, K.M.; Bacmann, A.; Agúndez, Marcelino ; Marcelino, Nuria ; Cernicharo, José ; Guzman, V.; Gerin, M.; Goicoechea, Javier R. ; Roueff, E.; Petit, F.L.; Pety, J.; Fuente, A.; Riviere-Marichalar, Pablo
KeywordsISM: abundances
ISM: clouds
Physical Data and Processes: astrochemistry
Issue Date27-Feb-2019
PublisherBlackwell Publishing
CitationMonthly Notices of the Royal Astronomical Society 485: 5777-5789 (2019)
AbstractWe have developed the first gas-grain chemical model for oxygen fractionation (also including sulphur fractionation) in dense molecular clouds, demonstrating that gas-phase chemistry generates variable oxygen fractionation levels, with a particularly strong effect for NO, SO, O, and SO. This large effect is due to the efficiency of the neutral O + NO, O + SO, and O + O exchange reactions. The modelling results were compared to new and existing observed isotopic ratios in a selection of cold cores. The good agreement between model and observations requires that the gas-phase abundance of neutral oxygen atoms is large in the observed regions. The SO/SO ratio is predicted to vary substantially over time, showing that it can be used as a sensitive chemical proxy for matter evolution in dense molecular clouds.
Description22 pags., 5 figs.
Publisher version (URL)http://dx.doi.org/10.1093/mnras/stz560
Identifiersdoi: 10.1093/mnras/stz560
issn: 1365-2966
Appears in Collections:(CFMAC-IFF) Artículos
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