Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...234l.195p&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 234, Dec. 15, 1979, p. L195-L198.
Astronomy and Astrophysics
Astrophysics
63
Ionization, Supernova Remnants, X Ray Spectra, K Lines, Pulsars
Scientific paper
X-ray emission up to 25 keV from the supernova remnants Cas A and Tycho has been detected with the A-2 spectroscopy experiment on HEAO 1. The spectra must include continuum components with effective temperature of about 10 to the 8th K which could arise from optically thin plasmas in the collisionless shock fronts. This is the first indication of electron-ion temperature equilibrium in the expanding shell of young remnants. The equivalent widths of the K-alpha and K-beta iron line blends in Cas A have also been measured and it is found that their ratio is not compatible with the measured X-ray temperature in the collisional ionization equilibrium model. Finally, an unsuccessful search has been conducted for hard X-ray pulsars in both remnants.
Pravdo Steven Howard
Smith Barham W.
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