Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...345..384w&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 345, Oct. 1, 1989, p. 384-392.
Astronomy and Astrophysics
Astronomy
8
Atomic Collisions, Interstellar Matter, Supernova Remnants, X Ray Astronomy, Gas Ionization, Grid Generation (Mathematics), Heavy Elements, Hydrogen, X Ray Spectra
Scientific paper
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.
Sarazin Craig L.
Wise Michael Wayne
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