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Where is OH and Does It Trace the Dark Molecular Gas (DMG)?

Li, Di; Tang, Ningyu; Nguyen, Hiep; Dawson, J.R.; Heiles, Carl; Xu, Duo; Pan, Zhichen; Goldsmith, Paul F; Gibson, S.J.; Murray, Claire; Robishaw, T.; McClure-Griffiths, Naomi; Dickey, John


Hydroxyl (OH) is expected to be abundant in diffuse interstellar molecular gas because it forms along with H2 under similar conditions and forms within a similar extinction range. We have analyzed absorption measurements of OH at 1665 MHz and 1667 MHz toward 44 extragalactic continuum sources, together with the J = 1–0 transitions of 12CO, 13CO, and C18O, and the J = 2–1 transition of 12CO. The excitation temperatures of OH were found to follow a modified lognormal distribution...[Show more]

CollectionsANU Research Publications
Date published: 2018
Type: Journal article
Source: Astrophysical Journal Supplement Series
DOI: 10.3847/1538-4365/aaa762
Access Rights: Open Access


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