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

Deprince, J. and Bautista, M. A. and Fritzsche, S. and García, J. A. and Kallman, T. R. and Mendoza, C. and Palmeri, P. and Quinet, P. (2020) Plasma-environment effects on K lines of astrophysical interest. III. IPs, K thresholds, radiative rates, and Auger widths in Fe IX – Fe XVI. Astronomy and Astrophysics, 635 . Art. No. A70. ISSN 0004-6361. doi:10.1051/0004-6361/201937088.

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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.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Deprince, J.0000-0002-3409-8232
García, J. A.0000-0003-3828-2448
Kallman, T. R.0000-0002-5779-6906
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.
Group:Space Radiation Laboratory
Funding AgencyGrant Number
Fonds pour la Formation à la Recherche dans l’Industrie et dans l’Agriculture (FRIA-Belgium)UNSPECIFIED
Fonds de la Recherche Scientifique (FNRS)UNSPECIFIED
Alexander von Humboldt FoundationUNSPECIFIED
Subject Keywords:black hole physics – plasmas – atomic data – X-rays: general
Record Number:CaltechAUTHORS:20200310-133032776
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Official Citation:Plasma-environment effects on K lines of astrophysical interest - III. IPs, K thresholds, radiative rates, and Auger widths in Fe IX – Fe XVI. J. Deprince, M. A. Bautista, S. Fritzsche, J. A. García, T. R. Kallman, C. Mendoza, P. Palmeri and P. Quinet. A&A, 635 (2020) A70; DOI:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:101828
Deposited By: Tony Diaz
Deposited On:10 Mar 2020 21:45
Last Modified:16 Nov 2021 18:06

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