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Description
In the context of black-hole accretion disks, we have computed plasma environment effects on the atomic parameters used to model the decay of K-vacancy states in moderately charged iron ions, namely FeIX-FeXVI. We use the fully relativistic multiconfiguration Dirac-Fock (MCDF) method approximating the plasma electron-nucleus and electron-electron screenings with a time-averaged Debye-Huckel potential. Modified ionization potentials, K thresholds, wavelengths, radiative emission rates and Auger widths are reported for astrophysical plasmas characterized by electron temperatures and densities respectively in the ranges 10^5^-10^7^K and 10^18^-10^22^cm^-3^. This study confirms that the high-resolution X-ray spectrometers onboard the future XRISM and ATHENA space missions could detect the lowering of the K edges of these ions due to the extreme plasma conditions occurring in accretion disks around compact objects.
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