VIDAL, Thomas; LOISON, Jean-Christophe; YASSIN JAZIRI, Adam; RUAUD, M.; GRATIER, P.; WAKELAM, Valentine

doi:10.1093/mnras/stx828

Métadonnées

Afficher la notice complète

Licence d’utilisation du document

VIDAL, Thomas
AMOR 2017

LOISON, Jean-Christophe
Institut des Sciences Moléculaires [ISM]

YASSIN JAZIRI, Adam

Langue

Article de revue

Ce document a été publié dans

Monthly Notices of the Royal Astronomical Society: Letters. 2017, vol. 469, p. 435-447

Oxford Journals

Résumé en anglais

Sulphur-bearing species are often used to probe the physical structure of star forming regions of the interstellar medium, but the chemistry of sulphur in these regions is still poorly understood. In dark clouds, sulphur is supposed to be depleted under a form which is still unknown despite numerous observations and chemical modeling studies that have been performed. In order to improve the modeling of sulphur chemistry, we propose an enhancement of the sulphur chemical network using experimental and theoretical literature. We test the effect of the updated network on the outputs of a three phases gas-grain chemical model for dark cloud conditions using different elemental sulphur abundances. More particularly, we focus our study on the main sulphur reservoirs as well as on the agreement between model predictions and the abundances observed in the dark cloud TMC-1 (CP). Our results show that depending on the age of the observed cloud, the reservoir of sulphur could either be atomic sulphur in the gas-phase or HS and H2S in icy grain bulks. We also report the first chemical model able to reproduce the abundances of observed S-bearing species in TMC-1 (CP) using as elemental abundance of sulphur its cosmic value.< Réduire

Mots clés en anglais

Astrophysics - Astrophysics of Galaxies

Métadonnées

Licence d’utilisation du document

On the reservoir of sulphur in dark clouds : chemistry and elemental abundance reconciled

Langue

Ce document a été publié dans

Résumé en anglais

Mots clés en anglais

DOI

Origine

Unités de recherche