Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982esasp.192...29h&link_type=abstract
In ESA Galactic and Extragalactic Infrared Spectroscopy p 29-31 (SEE N83-18593 08-88)
Astronomy and Astrophysics
Astronomy
8
Cooling, High Temperature Gases, Hydrogen Masers, Hydroxyl Radicals, Infrared Spectroscopy, Interstellar Masers, Line Spectra, H Ii Regions, Infrared Astronomy, Interstellar Gas, Interstellar Radiation, Ions, Models, Ultraviolet Radiation
Scientific paper
OH can contain a large fraction of the oxygen in hot (T approximately equals 1000 K) gas bathed in a strong ultraviolet radiation field. Interstellar OH masers probably exist in hot gas cooled by the emission of H2 and OH infrared line radiation and heated by the magnetic precursors of shocks preceding expanding HII regions. If ion streaming provides sufficient energy to drive the reaction of S+ with H2, the hottest gas may be in the precursor regions and the masers will be located in gas which has not been accelerated with respect to the upstream flow. If ion streaming provides sufficient energy to drive the reaction of C+ with H2 to form CH+ in diffuse clouds, a number of difficulties with shock models of its production are removed.
Dalgarno Alexander
Hartquist Thomas W.
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