Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aipc..774..219d&link_type=abstract
X-RAY DIAGNOSTICS OF ASTROPHYSICAL PLASMAS: Theory, Experiment, and Observation. AIP Conference Proceedings, Volume 774, pp. 21
Astronomy and Astrophysics
Astrophysics
Astrophysical Plasma, Ionisation, X-Ray Spectra, Supernova Remnants, Computer Aided Analysis, Magnetohydrodynamics And Plasmas, Ionization Of Plasmas, Spectroscopy And Spectrophotometry, X-Ray Sources, X-Ray Bursts, Supernova Remnants
Scientific paper
It is desirable to calculate the X-ray emission spectrum from a (region of a) plasma that is not in ionization equilibrium, e.g., with application to supernova remnants, SNRs. Such a plasma will generally have ionization fractions that are not directly related to the local electron temperature and, in the case of SNR ejecta, may contain little or no H and He. This work describes the use of a currently available database, ATOMDB, and software, ISIS, to generate spectra for a non-equilibrium ionization, NEI, plasma which is specified by explicit densities and ionization fractions and an independent electron temperature. An example spectrum is shown and discussed. The approach here does have some deficiencies currently: not all relevant inner-shell lines are included, there are no Cr lines, and continua spectra are not given on an ion-by-ion basis. Finally, in the low density, NEI case, it may be useful to consider the emission components that arise from each ``quiescent'' ion.
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