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Published March 2020 | Published + Accepted Version
Journal Article Open

Plasma-environment effects on K lines of astrophysical interest. III. IPs, K thresholds, radiative rates, and Auger widths in Fe IX – Fe XVI


Aims. In the context of black-hole accretion disks, we aim to compute the plasma-environment effects on the atomic parameters used to model the decay of K-vacancy states in moderately charged iron ions, namely Fe IX – Fe XVI. Methods. We used the fully relativistic multiconfiguration Dirac–Fock method approximating the plasma electron–nucleus and electron–electron screenings with a time-averaged Debye–Hückel potential. Results. We report modified ionization potentials, K-threshold energies, wavelengths, radiative emission rates, and Auger widths for plasmas characterized by electron temperatures and densities in the ranges 10⁵−10⁷ K and 10¹⁸−10²² cm⁻³. Conclusions. This study confirms that the high-resolution X-ray spectrometers onboard the future XRISM and Athena space missions will be capable of detecting the lowering of the K edges of these ions due to the extreme plasma conditions occurring in accretion disks around compact objects.

Additional Information

© 2020 ESO. Article published by EDP Sciences. Received 8 November 2019; Accepted 29 January 2020; Published online 09 March 2020. JD is Research Fellow of the Belgian Fund for Research Training in Industry and Agriculture (FRIA) while PP and PQ are, respectively, Research Associate and Research Director of the Belgian Fund for Scientific Research (F.R.S.-FNRS). Financial supports from these organizations, as well as from the NASA Astrophysics Research and Analysis Program (grant 80NSSC17K0345) are gratefully acknowledged. JAG acknowledges support from the Alexander von Humboldt Foundation.

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Accepted Version - 2001.11915.pdf


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August 19, 2023
October 19, 2023