Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 449, Issue 1, Pages L11-L15Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnrasl/slu204
Keywords
molecular data; stars: formation; ISM: molecules; radio lines: ISM; submillimetre: ISM
Categories
Funding
- European Commission [283393]
- PRIN INAF - JEDI
- Italian Ministero dell'Istruzione, Universita e Ricerca
- European Union [267251]
- French Space Agency CNES
- Spanish MINECO [FIS2012-32096]
- STFC [ST/M001334/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/M001334/1] Funding Source: researchfish
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The formation of complex organic molecules (COMs) in protostellar environments is a hotly debated topic. In particular, the relative importance of the gas phase processes as compared to a direct formation of COMs on the dust grain surfaces is so far unknown. We report here the first high-resolution images of acetaldehyde (CH3CHO) emission towards the chemically rich protostellar shock L1157-B1, obtained at 2 mm with the IRAM Plateau de Bure interferometer. Six blueshifted CH3CHO lines with E-u = 26-35 K have been detected. The acetaldehyde spatial distribution follows the young (similar to 2000 yr) outflow cavity produced by the impact of the jet with the ambient medium, indicating that this COM is closely associated with the region enriched by iced species evaporated from dust mantles and released into the gas phase. A high CH3CHO relative abundance, 2-3 x 10(-8), is inferred, similarly to what found in hot corinos. Astrochemical modelling indicates that gas phase reactions can produce the observed quantity of acetaldehyde only if a large fraction of carbon, of the order of 0.1 per cent, is locked into iced hydrocarbons.
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