On the Structure of the Iron K-Edge

Abstract

It is shown that the commonly held view of a sharp Fe K edge must be modified if the decay pathways of the series of resonances converging to the K thresholds are adequately taken into account. These resonances display damped Lorentzian profiles of nearly constant widths that are smeared to impose continuity across the threshold. By modeling the effects of K damping on opacities, it is found that the broadening of the K edge grows with the ionization level of the plasma and that the appearance at high ionization of a localized absorption feature at 7.2 keV is identified as the K-beta unresolved transition array.

10 pages, 3 figures, ApJ 577, L119, 2002

References in corpus (1)

• Extreme X-ray variability in the luminous quasar PDS 456

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