Structure of the W3A Low-density Foreground Region

• Published in: The Astrophysical journal Vol. 952; no. 2; pp. 102 - 120
• Main Authors: Goldsmith, Paul. F., Langer, William D., Seo, Youngmin, Pineda, Jorge, Stutzki, Jürgen, Guevara, Christian, Aladro, Rebeca, Justen, Matthias
• Format: Journal Article
• Language: English
• Published: Philadelphia The American Astronomical Society 01.08.2023; IOP Publishing
• Subjects: Absorption; Astrophysics; Emission; Fine structure; Gas absorption; Giant molecular clouds; Low density materials; Modelling; Photodissociation; Photodissociation regions; Proton density (concentration); Star & galaxy formation; Star formation; Stars; Submillimeter astronomy; Tracers

We present analysis of [O i ] 63 μ m and CO J = 5 − 4 and 8 − 7 multiposition data in the W3A region and use it to develop a model for the extended low-density foreground gas that produces absorption features in the [O i ] and J = 5 − 4 CO lines. We employ the extinction to the exciting stars of the...