HI-to-H2 transitions in the Perseus Molecular Cloud
Shmuel Bialy, Amiel Sternberg, Min-Young Lee, Franck Le Petit, Evelyne, Roueff
TL;DR
This paper applies a theoretical model to analyze HI and H2 observations in the Perseus Molecular Cloud, revealing the roles of different gas phases in shielding and molecular transition processes.
Contribution
It introduces a detailed analysis of HI-to-H2 transitions in Perseus, highlighting the significance of thermally-unstable gas alongside cold neutral gas.
Findings
Both CNM and UNM contribute to shielding in Perseus.
Thermally-unstable gas plays a significant role in H2 formation.
The model constrains physical properties of HI shielding envelopes.
Abstract
We apply the Sternberg et al. (2014) theoretical model to analyze HI and H2 observations in the Perseus molecular cloud. We constrain the physical properties of the HI shielding envelopes and the nature of the HI-to-H2 transitions. Our analysis (Bialy et al. 2015) implies that in addition to cold neutral gas (CNM), less dense thermally-unstable gas (UNM) significantly contributes to the shielding of the H2 cores in Perseus.
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