Collisional Excitation and Non-LTE Modeling of Interstellar Chiral Propylene Oxide - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue The Astrophysical Journal Année : 2022

Collisional Excitation and Non-LTE Modeling of Interstellar Chiral Propylene Oxide

Résumé

The first set of theoretical rotational cross sections for propylene oxide (CH3CHCH2O) colliding with cold He atoms has been obtained at the full quantum level using a high-accuracy potential energy surface. By scaling the collision reduced mass, rotational rate coefficients for collisions with para-H-2 are deduced in the temperature range 5-30 K. These collisional coefficients are combined with radiative data in a non-LTE radiative transfer model in order to reproduce observations of propylene oxide made toward the Sagittarius B2(N) molecular cloud with the Green Bank and Parkes radio telescopes. The three detected absorption lines are found to probe the cold (similar to 10 K) and translucent (n (H) similar to 2000 cm(-3)) gas in the outer edges of the extended Sgr B2(N) envelope. The derived column density for propylene oxide is N (tot) similar to 3 x 10(12) cm(-2), corresponding to a fractional abundance relative to total hydrogen of similar to 2.5 x 10(-11). The present results are expected to help our understanding of the chemistry of propylene oxide, including a potential enantiomeric excess, in the cold interstellar medium.
Fichier principal
Vignette du fichier
Dzenis_2022_Collisional Excitation and Non-LTE Modeling of Interstellar Chiral Propylene Oxide_ApJ_926_3.pdf (2.68 Mo) Télécharger le fichier
Origine : Publication financée par une institution

Dates et versions

hal-03592648 , version 1 (01-03-2022)
hal-03592648 , version 2 (01-03-2022)

Licence

Paternité

Identifiants

Citer

Karlis Dzenis, A Faure, B. A. Mcguire, A. J. Remijan, P. J. Dagdigian, et al.. Collisional Excitation and Non-LTE Modeling of Interstellar Chiral Propylene Oxide. The Astrophysical Journal, 2022, 926 (1), ⟨10.3847/1538-4357/ac43b5⟩. ⟨hal-03592648v2⟩
78 Consultations
44 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More