Computer Science – Numerical Analysis
Scientific paper
Mar 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...244..406u&link_type=abstract
Astrophysical Journal, Part 1, vol. 244, Mar. 1, 1981, p. 406-425.
Computer Science
Numerical Analysis
27
Gas Temperature, Hydrogen Clouds, Lyman Alpha Radiation, Quasars, Spin Temperature, Centimeter Waves, Ejecta, Fine Structure, Hyperfine Structure, Kinetic Energy, Molecular Energy Levels, Numerical Analysis, Stellar Mass Ejection, Transport Properties
Scientific paper
Twenty-one centimeter radiation emitted by QSOs can drive the spin temperature of neighboring H I clouds above their local kinetic temperatures. The consequent decrease in 21-cm opacity makes these ejected clouds unlikely sites for 21-cm absorption unless Lyman-alpha radiation generated by the same QSO is bright enough to determine the hyperfine level populations of the local hydrogen. This paper considers how the Lyman-alpha is produced and transported, and how it affects the spin temperature of an ejected cloud. It is found that photoionization of the absorber by Lyman continuum radiation emitted by the QSO results in Lyman-alpha production in the ionized H II portion of the absorber. In addition, it is shown that all solutions to the transfer equation predict characteristic double-hump emission features in the emergent spectrum.
Urbaniak J. J.
Wolfe Arthur M.
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