2019MNRAS.485.5777L

Query : 2019MNRAS.485.5777L

2019MNRAS.485.5777L - Mon. Not. R. Astron. Soc., 485, 5777-5789 (2019/June-1)

Oxygen fractionation in dense molecular clouds.

LOISON J.-C., WAKELAM V., GRATIER P., HICKSON K.M., BACMANN A., AGUNDEZ M., MARCELINO N., CERNICHARO J., GUZMAN V., GERIN M., GOICOECHEA J.R., ROUEFF E., LE PETIT F., PETY J., FUENTE A. and RIVIERE-MARICHALAR P.

Abstract (from CDS):

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, O2, and SO2. This large effect is due to the efficiency of the neutral 18O + NO, 18O + SO, and 18O + O2 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 S16O/S18O 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.

Abstract Copyright: © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): ISM: abundances - ISM: clouds - Physical Data and Processes: astrochemistry

Simbad objects: 10

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Number of rows : 10
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 Barnard 1 MoC 03 33 16.3 +31 07 51           ~ 350 0
2 [HKM99] B1-b cor 03 33 20.32 +31 07 21.5           ~ 242 0
3 TMC-1 MoC 04 41 45.9 +25 41 27           ~ 1872 0
4 LDN 1544 DNe 05 04 16.6 +25 10 48           ~ 965 0
5 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2421 1
6 NAME Horsehead Nebula DNe 05 40 59.0 -02 27 30           ~ 555 0
7 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3969 1
8 LDN 1689B DNe 16 34 42.1 -24 36 11           ~ 181 0
9 IRAS 18148-0440 Y*O 18 17 29.94 -04 39 39.3           ~ 97 0
10 LDN 483 DNe 18 17 35 -04 39.8           ~ 359 0

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