The roles of polycyclic aromatic hydrocarbons in dark cloud chemistry: New constraints on sulphur-bearing species
Autor
Ge, Jixing
Mardones, Diego
Inostroza, Natalia
Peng, Yaping
Resumen
The recent detection of c-C6H5CN in the dark cloud TMC-1 provides a new evidence of polycyclic aromatic hydrocarbons (PAHs) in dark clouds. However, knowledge of PAHs in dark cloud chemistry is still very limited. In this study, we investigate the effects of PAHs on the chemistry in dark clouds by coupling published PAH-related chemistry with a gas-grain reaction network. We found that abundances of some ice species, such as OCS, OCN, C2H5OH and HCOOCH3, are enhanced by more than two orders of magnitude due to the inclusion of PAHs in the gas-grain chemistry through accretion and subsequent reactions in ice. Especially, combining PAHs with gas-grain chemistry in dark clouds provides an alternative way to reach a good overall agreement of sulphur-bearing species in both the gas and solid phases using the cosmic value of sulphur. With the inclusion of PAHs, CS + O → OCS makes a contribution of ∼5-10 per cent to solid-phase OCS together with CO + S → OCS (∼80-90 per cent), depending on the initial abundances, chemical age and PAH parameters.
Colecciones
Ítems relacionados
Mostrando ítems relacionados por Título, autor o materia.
-
Article
Formation pathways of complex organic molecules: OH•projectile colliding with methanol ice mantle (CH3OH)10 (2020)
Inostroza-Pino, Natalia; Mardones, Diego; Ge, Jixing J.X.; MacLeod-Carey, Desmond (EDP Sciences, 2020-09-01)In this article, we simulated the collisions of an OH• projectile impacting on a methanol cluster formed by ten units of methanol to mimic an ice mantle (CH3OH)10. The chemical processes occurring after the impact were ... -
Article
Methanediol CH2(OH)2and hydroxymethyl CH2OH+: key organic intermediates on the path to complex organic molecules (2024)
Heyser Valencia, Cristopher; Inostroza-Pino, Natalia (EDP Sciences, 2022)Context. Ab initio molecular dynamics simulations were carried out to study the formation pathways to complex organic molecules when a OH+ projectile hit an interstellar dust grain covered only by methanol molecules. The ... -
Article
Formation of formaldehyde through methanol-ice-mantle (CH3OH)10bombardment by OH+cation (2021)
Inostroza-Pino, Natalia; MacLeod-Carey, Desmond; Heyser, Cristopher; Mardones, Diego; Espinoza, Carlos; Ge, Jixing (EDP Sciences, 2021-06-01)Context. Formaldehyde H2CO was the first organic polyatomic molecule discovered in the interstellar medium to have been detected in a variety of sources. However, pathways to synthesize this molecule under interstellar ...