DI-UMONS : Dépôt institutionnel de l’université de Mons

Recherche transversale
(titres de publication, de périodique et noms de colloque inclus)
2020-03-11 - Article/Dans un journal avec peer-review - Anglais - 6 page(s)

Deprince Jérome , Bautista M.A., Fritsche S., Garcia J., Kallman T.R., Mendoza C., Palmeri Patrick , Quinet Pascal , "Plasma-environment effects on K lines of astrophysical interest III. IPs, K thresholds, radiative rates, and Auger widths in Fe IX - Fe XVI." in Astronomy and Astrophysics, 635, A70

  • Edition : EDP Sciences, Les Ulis (France)
  • Codes CREF : Spectroscopie [électromagnétisme, optique, acoustique] (DI1255), Astrophysique (DI1455)
  • Unités de recherche UMONS : Physique Atomique et Astrophysique (S888)
  • Instituts UMONS : Institut de Recherche sur les Systèmes Complexes (Complexys)
  • Centres UMONS : Algèbre, Géométrie et Interactions fondamentales (AGIF)
Texte intégral :

Abstract(s) :

(Anglais) 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.