[en] 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 10^5 -10^7 K and 10^18 -10^22 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.
Research center :
AGIF - Algèbre, Géométrie et Interactions fondamentales
Disciplines :
Physics Space science, astronomy & astrophysics
Author, co-author :
Deprince, Jérome ; Université de Mons > Faculté des Sciences > Physique atomique et astrophysique
Bautista, M.A.
Fritsche, S.
Garcia, J.
Kallman, T.R.
Mendoza, C.
Palmeri, Patrick ; Université de Mons > Faculté des Sciences > Service de Physique atomique et astrophysique
Quinet, Pascal ; Université de Mons > Faculté des Sciences > Service de Physique atomique et astrophysique
Language :
English
Title :
Plasma-environment effects on K lines of astrophysical interest III. IPs, K thresholds, radiative rates, and Auger widths in Fe IX - Fe XVI.
Publication date :
11 March 2020
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences, Les Ulis, France
Volume :
635
Peer reviewed :
Peer Reviewed verified by ORBi
Research unit :
S888 - Physique atomique et Astrophysique
Research institute :
R150 - Institut de Recherche sur les Systèmes Complexes
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