Physics – Atomic Physics
Scientific paper
May 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...188.7412l&link_type=abstract
American Astronomical Society, 188th AAS Meeting, #74.12; Bulletin of the American Astronomical Society, Vol. 28, p.949
Physics
Atomic Physics
Scientific paper
We describe first results from an updated X-ray nonequilibrium-ionization code using as a dynamical substrate a Sedov-Taylor blast wave appropriate for a supernova remnant (SNR). The code has extensively updated atomic physics, particularly in iron L-shell transitions, and allows an arbitrary ratio beta of postshock electron temperature T_e to ion temperature T_i, to describe possible nonthermal plasma heating processes in the shock wave. We show that at the resolution of the ASCA X-ray satellite, our calculated models are poorly fit by simple models in the XSPEC data-reduction package, such as constant-temperature nonequilibrium-ionization ``neq'' models with a single ionization timescale. Models with the same postshock electron temperature but varying ion temperatures (i.e., varying beta with constant beta T_i) produce quite different high-energy continua and should be distinguishable in practice, holding out the possibility of measuring the extent of plasma heating. We show that a simple multi-zone model superposing several ``neq'' models with different temperatures and with ionization timescales chosen appropriately can provide a much better fit to our full simulations, and the fitted temperatures accurately reflect the mass-weighted temperature of our full Sedov model. We plan to adapt our models for use in XSPEC, and make them available to the general astronomical community.
Blondin John
Borkowski Kazik
Lyerly William J.
Reynolds Stephen P.
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