The effects of non-equilibrium ionization on the X-ray emission of supernova remnants

Details The effects of non-equilibrium ionization on the X-ray emission of supernova remnants The effects of non-equilibrium ionization on the X-ray emission of supernova remnants

May 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26as...48..305g&link_type=abstract

Astronomy and Astrophysics Supplement Series, vol. 48, May 1982, p. 305-331. Research supported by the Niels Stensen Stichting.

Astronomy and Astrophysics

Astrophysics

41

Nonequilibrium Ionization, Stellar Evolution, Stellar Radiation, Stellar Spectra, Supernova Remnants, X Ray Spectroscopy, Emission Spectra, Spectrum Analysis, Stellar Models, X Ray Spectra

Scientific paper

It is shown that nonequilibrium conditions of the ionization balance in a supernova remnant strongly affect the emergent X-ray spectrum. The continuum emission is enhanced by two-photon decay radiation mainly due to oxygen for wavelengths larger than about 20 A, whereas it is suppressed by the lack of recombination radiation of bare nuclei below about 10 A. The line emission is significantly intensified especially for wavelengths larger than about 10 A where transitions in helium-like and lower ions are dominant. The strength of individual lines departs sometimes by orders of magnitude from the equilibrium prediction even for older remnants, while the soft X-ray luminosity is larger by more than a factor of 10 than in the case where the ionization balance immediately follows the temperature changes. It is shown that a multitemperature component spectrum emerges quite naturally owing to nonequilibrium ionization.

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