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Author Wise, M. W. ♦ Sarazin, C. L.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ♦ SUPERNOVA REMNANTS ♦ X-RAY SPECTRA ♦ CHARGE EXCHANGE ♦ COMPARATIVE EVALUATIONS ♦ ELECTRON COLLISIONS ♦ EXCITATION ♦ HYDROGEN ♦ INTERSTELLAR SPACE ♦ ION-ATOM COLLISIONS ♦ IONIZATION ♦ MATHEMATICAL MODELS ♦ MESH GENERATION ♦ ATOM COLLISIONS ♦ COLLISIONS ♦ COSMIC RADIO SOURCES ♦ ELEMENTS ♦ ENERGY-LEVEL TRANSITIONS ♦ ION COLLISIONS ♦ NONMETALS ♦ SPACE ♦ SPECTRA ♦ Astrophysics & Cosmology- Stars & Quasi-Stellar, Radio & X-Ray Sources
Abstract The X-ray line emission excited by charge transfer between neutral hydrogen and the hydrogenic or fully stripped ions of heavy elements has been computed for a grid of nonequilibrium ionization models for supernova remnants. The effects of charge transfer excitation on the X-ray spectra of supernova remnants are discussed. The charge transfer process depends very sensitively upon the abundance of neutral hydrogen behind the shock. Consequently, a careful treatment of the ionization of hydrogen was required. The model line fluxes are compared with those excited by conventional collisional processes involving electrons. Results are presented in the form of contour plots for both the flux excited by charge transfer and the ratio of the charge transfer flux to that associated solely with collisional processes involving electrons. Charge transfer never contributes more than 10 percent of the flux of the strongest electron collisionally excited lines, and its contribution is typically 0.001 to 10 to the -5th for a shock moving into a medium composed of neutral hydrogen. 22 refs.
ISSN 0004637X
Educational Use Research
Learning Resource Type Article
Publisher Date 1989-10-01
Publisher Place United States
Journal Astrophysical Journal
Volume Number 345


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