Heyl, Johannes;
Lamberts, Thanja;
Viti, Serena;
Holdship, Jonathan;
(2023)
Investigating the impact of reactions of C and CH with molecular hydrogen on a glycine gas-grain network.
Monthly Notices of the Royal Astronomical Society
, 520
(1)
pp. 503-512.
10.1093/mnras/stad139.
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Abstract
The impact of including the reactions of C and CH with molecular hydrogen in a gas-grain network is assessed via a sensitivity analysis. To this end, we vary three parameters, namely, the efficiency for the reaction C + H2 −→ CH2, and the cosmic ray ionization rate, with the third parameter being the final density of the collapsing dark cloud. A grid of 12 models is run to investigate the effect of all parameters on the final molecular abundances of the chemical network. We find that including reactions with molecular hydrogen alters the hydrogen economy of the network; since some species are hydrogenated by molecular hydrogen, atomic hydrogen is freed up. The abundances of simple molecules produced from hydrogenation, such as CH4, CH3OH, and NH3, increase, and at the same time, more complex species such as glycine and its precursors see a significant decrease in their final abundances. We find that the precursors of glycine are being preferentially hydrogenated, and therefore glycine itself is produced less efficiently.
| Type: | Article |
|---|---|
| Title: | Investigating the impact of reactions of C and CH with molecular hydrogen on a glycine gas-grain network |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/stad139 |
| Publisher version: | https://doi.org/10.1093/mnras/stad139 |
| Language: | English |
| Additional information: | Copyright © 2023 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited. |
| Keywords: | astrochemistry, ISM: abundances, ISM: molecules |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10172245 |
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