153 research outputs found
Inner-shell ionization, radiative losses and thermal conductivity in young SNRs
Self-consistent treatment of time-dependent ionization in hydrodynamical
calculations of the X-ray emission from young supernova remnants has been
performed. The novel feature of the calculations is that K_alpha lines from
species produced by inner-shell collisional ionization are included. Parameters
of the shocked ejecta are found from fitting the model spectrum to the observed
one. The application of the method to Tycho SNR using the classical
deflagration model W7 for the explosion enables us to well reproduce the
observed X-ray spectra and radial brightness profiles of the remnant.Comment: 4 pages, 3 figure, accepted for publication in MNRA
Oxygen emission in remnants of thermonuclear supernovae as a probe for their progenitor system
Recent progress in numerical simulations of thermonuclear supernova
explosions brings up a unique opportunity in studying the progenitors of Type
Ia supernovae. Coupling state-of-the-art explosion models with detailed
hydrodynamical simulations of the supernova remnant evolution and the most
up-to-date atomic data for X-ray emission calculations makes it possible to
create realistic synthetic X-ray spectra for the supernova remnant phase.
Comparing such spectra with high quality observations of supernova remnants
could allow to constrain the explosion mechanism and the progenitor of the
supernova. The present study focuses in particular on the oxygen emission line
properties in young supernova remnants, since different explosion scenarios
predict a different amount and distribution of this element. Analysis of the
soft X-ray spectra from supernova remnants in the Large Magellanic Cloud and
confrontation with remnant models for different explosion scenarios suggests
that SNR 0509-67.5 could originate from a delayed detonation explosion and SNR
0519-69.0 from an oxygen-rich merger.Comment: 8 pages, 4 figures, MNRAS accepte
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