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Title: | Oxygen fractionation in dense molecular clouds |
Authors: | Loison, J.C.; Wakelam, V.; Gratier, P.; Hickson, K.M.; Bacmann, A.; Agúndez, Marcelino ![]() ![]() ![]() ![]() ![]() |
Keywords: | ISM: abundances ISM: clouds Physical Data and Processes: astrochemistry |
Issue Date: | 27-Feb-2019 |
Publisher: | Blackwell Publishing |
Citation: | Monthly Notices of the Royal Astronomical Society 485: 5777-5789 (2019) |
Abstract: | We 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. |
Description: | 22 pags., 5 figs. |
Publisher version (URL): | http://dx.doi.org/10.1093/mnras/stz560 |
URI: | http://hdl.handle.net/10261/207946 |
DOI: | 10.1093/mnras/stz560 |
Identifiers: | doi: 10.1093/mnras/stz560 issn: 1365-2966 |
Appears in Collections: | (CFMAC-IFF) Artículos |
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Oxygen fractionation.pdf | 1,73 MB | Adobe PDF | ![]() View/Open |
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