PHOTODISSOCIATION REGIONS

Far-UV radiation in molecular clouds photodissociates molecular hydrogen and creates neutral atomic layers between the ionized and the molecular material. Hydrogen molecules reform efficiently on grain surfaces where adsorbed H reacts with other molecules. Results of models of isothermal uniform pho...

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Bibliographic Details
Published in:Publications of the Astronomical Society of the Pacific 1991-08, Vol.103 (666), p.838-842
Main Author: ESCALANTE, VLADIMIR
Format: Article
Language:English
Subjects:
Astronomy
Atoms
Density
Earth, ocean, space
Exact sciences and technology
Ground state
Hydrogen
Interstellar medium (ism) and nebulae in milky way
Molecular clouds
Molecular clouds, h2 clouds, dense clouds, and dark clouds
Molecules
Photolysis
Photons
Pumping
Radiation absorption
Stellar systems. Galactic and extragalactic objects and systems. The universe
THE TEXAS–MEXICO CONFERENCE ON NEBULAE AND ABUNDANCES
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Summary:Far-UV radiation in molecular clouds photodissociates molecular hydrogen and creates neutral atomic layers between the ionized and the molecular material. Hydrogen molecules reform efficiently on grain surfaces where adsorbed H reacts with other molecules. Results of models of isothermal uniform photodissociation regions that reproduce the main characteristics observed in the 21-cm hydrogen emission are shown.
ISSN:0004-6280
1538-3873
DOI:10.1086/132890