Volume 635, March 2020
|Number of page(s)||6|
|Section||Atomic, molecular, and nuclear data|
|Published online||09 March 2020|
Plasma-environment effects on K lines of astrophysical interest
III. IPs, K thresholds, radiative rates, and Auger widths in Fe IX – Fe XVI⋆
Physique Atomique et Astrophysique, Université de Mons – UMONS, 7000 Mons, Belgium
2 Department of Physics, Western Michigan University, Kalamazoo, MI 49008, USA
3 Helmholtz Institut Jena, 07743 Jena, Germany
4 Theoretisch Physikalisches Institut, Friedrich Schiller Universität Jena, 07743 Jena, Germany
5 Cahill Center for Astronomy and Astrophysics, California Institute of Technology, Pasadena, CA 91125, USA
6 Dr. Karl Remeis-Observatory and Erlangen Centre for Astroparticle Physics, Sternwartstr. 7, 96049 Bamberg, Germany
7 NASA Goddard Space Flight Center, Code 662, Greenbelt, MD 20771, USA
8 IPNAS, Université de Liège, Sart Tilman, 4000 Liège, Belgium
Accepted: 29 January 2020
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.
Key words: black hole physics / plasmas / atomic data / X-rays: general
Full Tables 4 and 5 are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (18.104.22.168) or via http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/635/A70
© ESO 2020
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