A proposed chemical scheme for HCCO formation in cold dense clouds
Langue
en
Article de revue
Ce document a été publié dans
Monthly Notice- Royal Astronomical Society -Letters-. 2015, vol. 453, n° 1, p. L48-L52
Wiley-Blackwell
Résumé en anglais
The ketenyl radical (HCCO) has recently been discovered in two cold dense clouds with a non-negligible abundance of a few 10-11 (compared to H2). Until now, no chemical network has been able to reproduce this observation. ...Lire la suite >
The ketenyl radical (HCCO) has recently been discovered in two cold dense clouds with a non-negligible abundance of a few 10-11 (compared to H2). Until now, no chemical network has been able to reproduce this observation. We propose here a chemical scheme that can reproduce HCCO abundances together with HCO, H2CCO and CH3CHO in the dark clouds Lupus-1A and L486. The main formation pathway for HCCO is the OH + CCH → HCCO + H reaction as suggested by Agúndez et al. but with a much larger rate coefficient than used in current models. Since this reaction has never been studied experimentally or theoretically, this larger value is based on a comparison with other similar systems.< Réduire
Mots clés en anglais
astrochemistry
ISM: abundances
ISM: clouds
ISM: molecules
Origine
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