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Probing the Conditions for the Atomic-to-Molecular Transition in the Interstellar Medium.
- Source :
- Proceedings of the International Astronomical Union; 6/9/2023, Vol. 17 Issue S373, p81-86, 6p
- Publication Year :
- 2023
-
Abstract
- We examine the physical conditions required for the formation of H<subscript>2</subscript> in the solar neighborhood by comparing H i emission and absorption spectra toward 58 lines of sight at b < −5<superscript>∘</superscript> to CO(1–0) and dust data. Our analysis of CO-associated cold and warm neutral medium (CNM and WNM) shows that the formation of CO-traced molecular gas is favored in regions with high column densities where the CNM becomes colder and more abundant. In addition, our comparison to the one-dimensional steady-state H i-to-H<subscript>2</subscript> transition model of Bialy et al. (2016) suggests that only a small fraction of the clumpy CNM participates in the formation of CO-traced molecular gas. Another possible interpretation would be that missing physical and chemical processes in the model could play an important role in H<subscript>2</subscript> formation. [ABSTRACT FROM AUTHOR]
- Subjects :
- MOLECULAR clouds
STELLAR mass
SPIN temperature
DENSITY
MOLECULAR gastronomy
Subjects
Details
- Language :
- English
- ISSN :
- 17439213
- Volume :
- 17
- Issue :
- S373
- Database :
- Complementary Index
- Journal :
- Proceedings of the International Astronomical Union
- Publication Type :
- Academic Journal
- Accession number :
- 164220799
- Full Text :
- https://doi.org/10.1017/S1743921322004896