X-ray emission spectra from ionizing plasmas

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Emission Spectra, Nonequilibrium Ionization, Nonequilibrium Plasmas, Plasma Spectra, X Ray Spectra, Eigenvalues, High Temperature Plasmas, Interstellar Matter, Ion Production Rates, Supernova Remnants

Scientific paper

Effects of non-equilibrium ionization on emission spectra are studied. Ionization rate equations are solved with the eigenvalue-method to avoid a numerical instability near the equilibrium and also to save time of computations. The author's scheme is valid for linear problems, and is applicable to solve closely coupled equations of time-dependent problems. As an example, he calculates emission spectra (1 - 160 Å) in the transient phase of ionization under interstellar conditions applicable to a shock-heated plasma. The results are useful for an analysis of the spectra from tenuous ionizing plasmas - such as supernova remnants.

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