Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990liaco..29..249n&link_type=abstract
In ESA, From Ground-Based to Space-Borne Sub-mm Astronomy p 249 (SEE N91-21986 13-89)
Astronomy and Astrophysics
Astronomy
Emission Spectra, Interstellar Masers, Interstellar Matter, Stellar Envelopes, Stellar Spectra, Submillimeter Waves, Water Masers, Interstellar Chemistry, Interstellar Gas, Late Stars, Molecular Excitation, Particle Collisions, Spectrum Analysis
Scientific paper
The excitation of maser emission in submillimeter transitions of interstellar and circumstellar water is considered. Using an escape probability method, the equilibrium populations in 349 rotational states of both ortho- and para-water under varying conditions of gas temperature, density, water abundance, and radiation field are determined. The results show that under suitable conditions, collisional excitation of warm (1000 K) interstellar gas may result in significant maser action in a total of 22 centimeter, millimeter, and submillimeter transitions of H2O.
Melnick Gary J.
Neufeld David A.
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