Where is OH and Does It Trace the Dark Molecular Gas (DMG)?
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]
|Collections||ANU Research Publications|
|Source:||Astrophysical Journal Supplement Series|
|Access Rights:||Open Access|
|01_Li_Where_is_OH_and_Does_It_Trace_2018.pdf||1.83 MB||Adobe PDF|
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