期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 475, 期 2, 页码 2016-2026出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stx3335
关键词
astrochemistry; stars: protostars; ISM: abundances; ISM: molecules
资金
- STFC [ST/M001334/1]
- ERC [336474]
- STFC studentship
- STFC through an Ernest Rutherford Fellowship [ST/L004801, ST/M004139]
- European Union's Horizon research and innovation programme under the Marie Sklodowska-Curie [664931]
- Italian Ministero dell'Istruzione, Universita e Ricerca
- Science and Technology Facilities Council [ST/M001334/1, ST/M004139/2] Funding Source: researchfish
- STFC [ST/M004139/2] Funding Source: UKRI
Glycolaldehyde (HOCH2CHO) and ethylene glycol ((CH2OH)(2)) are two complex organic molecules detected in the hot cores and hot corinos of several star-forming regions. The ethylene glycol/glycolaldehyde abundance ratio seems to show an increase with the source luminosity. In the literature, several surface-chemistry formation mechanisms have been proposed for these two species. With the UCLCHEM chemical code, we explored the different scenarios and compared the predictions for a range of sources of different luminosities with the observations. None of the scenarios reproduce perfectly the trend. A better agreement is, however, found for a formation through recombination of two HCO radicals followed by successive hydrogenations. The reaction between HCO and CH2OH could also contribute to the formation of glycolaldehyde in addition to the hydrogenation pathway. The predictions are improved when a trend of decreasing H-2 density within the core region with T >= 100 K as a function of luminosity is included in the model. Destruction reactions of complex organic molecules in the gas phase would also need to be investigated, since they can affect the abundance ratios once the species have desorbed in the warm inner regions of the star-forming regions.
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