On the study of NEI regime in SNR's: emission model and ROSAT PSPC spectral fitting simulations.

Details On the study of NEI regime in SNR's: emission model and ROSAT PSPC spectral fitting simulations. On the study of NEI regime in SNR's: emission model and ROSAT PSPC spectral fitting simulations.

Feb 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996rftu.proc..235b&link_type=abstract

International Conference on X-ray Astronomy and Astrophysics: Röntgenstrahlung from the Universe, p. 235 - 236

Astronomy and Astrophysics

Astrophysics

1

Supernova Remnants: X Rays

Scientific paper

The authors developed and tested a non-equilibrium of ionization (NEI) emission model to study the X-ray emission of supernova remnants (SNRs) with a parametric fitting approach. They present results of ROSAT PSPC spectral fitting simulations with their emission model. They have found that, the confidence ranges of the plasma temperature tend to be larger with respect to fits with equilibrium of ionization models, the χ2 function is characterized by local minima in the parameter space, and there is a strong dependence of the fit results on the initial value of the ionization time used in the minimization algorithm. They explain these findings in terms of the particular nature of the model. It is concluded that, in typical cases of young and middle-aged SNR with a moderate ISM absorption, the local minima can be avoided by the χ2 fitting spectra with 5000 counts or more. Finally, the authors briefly discuss how this limit affects the feasibility of spatially resolved spectral analysis of SNRs observed with the PSPC.

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