Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000rmxac...9..246s&link_type=abstract
"Astrophysical Plasmas: Codes, Models, and Observations, Proceedings of the conference held in Mexico City, October 25-29, 1999,
Astronomy and Astrophysics
Astrophysics
Scientific paper
We present new calculations on the contribution from cooling hot gas in old supernova remnants to the photoionization of warm ionized gas in the Galaxy. We show that the emission from the hot gas in cooling supernova remnants (SNRs) is soft (bar E ~ 20 eV) and, as a result, the efficiency of conversion of supernova explosion energy into ionizing photons is high, ~30 - 40%. Given this high efficiency, supernova remnants could be responsible for up to 50% of the emission measure observed for the warm ionized medium in the Galaxy. Our model flux is also consistent with the diffuse soft X-ray background at high latitude and with soft X-ray observations of external galaxies. We consider the ionization of the clouds observed towards the halo star HD 93521, for which there are no O stars close to the line of sight. We find that the observed ionization can be explained successfully by our model flux.
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