Physics – Plasma Physics
Scientific paper
Oct 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979natur.281..656i&link_type=abstract
Nature, vol. 281, Oct. 25, 1979, p. 656, 657.
Physics
Plasma Physics
6
Light Emission, Nonequilibrium Ionization, Shock Wave Luminescence, Supernova Remnants, X Ray Sources, Astronomical Models, Emission Spectra, Interstellar Matter, Iron, Plasma Physics, X Ray Spectra
Scientific paper
The discrepancy between the X-ray emission spectrum of the Puppis A supernova remnant and its forbidden Fe XIV emission intensity at 5303 A is explained in terms of the nonequilibrium ionization of the X-ray source. It is proposed that the dominant X-ray source is a shock-heated interstellar cloud in which X-ray emission may be independent of iron emission. The forbidden Fe XIV luminosity of the shock wave responsible for nonequilibrium ionization and Pup A X-ray emission is then estimated to be on the order of the values observed (1 to 5 x 10 to the 32 d-squared erg/sec, where d is the distance to Pup A), and to be in agreement with the upper limit to the forbidden Fe X/forbidden Fe XIV luminosity ratio detected.
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