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Probing the Conditions for the Atomic-to-Molecular Transition in the Interstellar Medium

Published online by Cambridge University Press:  09 June 2023

Gyueun Park Open the ORCID record for Gyueun Park [Opens in a new window] ,
Min-Young Lee ,
Shmuel Bialy ,
Blakesley Burkhart ,
Joanne Dawson ,
Carl Heiles ,
Di Li Open the ORCID record for Di Li [Opens in a new window] ,
Claire Murray ,
Hiep Nguyen  and
Anita Petzler
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Gyueun Park
Affiliation:
Korea Astronomy & Space Science Institute, 776 Daedeok-daero, Yuseong-gu, Daejeon 34055, Republic of Korea email:gpark@kasi.re.kr Department of Astronomy & Space Science, University of Science and Technology, 217 Gajeong-ro, Yuseong-gu, Daejeon 34113, Republic of Korea email: mlee@kasi.re.kr
Min-Young Lee
Affiliation:
Korea Astronomy & Space Science Institute, 776 Daedeok-daero, Yuseong-gu, Daejeon 34055, Republic of Korea email:gpark@kasi.re.kr Department of Astronomy & Space Science, University of Science and Technology, 217 Gajeong-ro, Yuseong-gu, Daejeon 34113, Republic of Korea email: mlee@kasi.re.kr
Shmuel Bialy
Affiliation:
Department of Astronomy, University of Maryland, College Park, MD 20742, USA
Blakesley Burkhart
Affiliation:
Department of Physics and Astronomy, Rutgers University, Piscataway, NJ 08854, USA Center for Computational Astrophysics, Flatiron Institute, 162 Fifth Avenue, New York, NY 10010, USA
Joanne Dawson
Affiliation:
Department of Physics and Astronomy, Macquarie University, NSW 2109, Australia
Carl Heiles
Affiliation:
Department of Astronomy, University of California, Berkeley, CA 94720, USA
Di Li
Affiliation:
National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, China NAOC-UKZN Computational Astrophysics Centre, University of KwaZulu-Natal, Durban 4000, South Africa Research Center for Intelligent Computing, Zhejiang Laboratory, Hangzhou 311100, China
Claire Murray
Affiliation:
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA Department of Physics & Astronomy, Johns Hopkins University, MD 21218, USA
Hiep Nguyen
Affiliation:
Research School of Astronomy and Astrophysics, The Australian National University, Canberra, ACT 2611, Australia
Anita Petzler
Affiliation:
Department of Physics and Astronomy, Macquarie University, NSW 2109, Australia
Snežana Stanimirović
Affiliation:
Department of Astronomy, University of Wisconsin, Madison, WI 53706-15821, USA
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Abstract

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We examine the physical conditions required for the formation of H2 in the solar neighborhood by comparing H i emission and absorption spectra toward 58 lines of sight at b < −5∘ 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-H2 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 H2 formation.

Keywords

ISM: atomsISM: cloudsdust, extinctionISM: moleculesISM: structureradio lines: ISM
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 17 , Symposium S373: Resolving the Rise and Fall of Star Formation in Galaxies (Aug 2022) , August 2021 , pp. 81 - 86
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Copyright
© The Author(s), 2023. Published by Cambridge University Press on behalf of International Astronomical Union

References

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