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CO-dark Molecular Gas Traced by HCO+ in the Diffuse Interstellar Medium

A classic problem in the study of the interstellar medium (ISM) is the near-invisibility of molecular hydrogen (H _2 ) in cold environments. Observations of CO emission are typically used to indirectly trace H _2 , but a significant fraction of H _2 in the diffuse ISM is not associated with any dete...

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Autori principali: Daniel R. Rybarczyk, Michael P. Busch, J. R. Dawson, Min-Young Lee, Gan Luo
Natura: Artigo
Lingua:Inglês
Pubblicazione: IOP Publishing 2026-01-01
Serie:The Astrophysical Journal
Soggetti:
Diffuse molecular clouds
Cold neutral medium
Neutral hydrogen clouds
Interstellar molecules
Molecular spectroscopy
Interstellar absorption
Accesso online:https://doi.org/10.3847/1538-4357/ae76d4
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