Volume 626, June 2019
|Number of page(s)||8|
|Section||Atomic, molecular, and nuclear data|
|Published online||18 June 2019|
Plasma environment effects on K lines of astrophysical interest
II. Ionization potentials, K thresholds, radiative rates, and Auger widths in Ne- through He-like iron ions (Fe XVII – Fe XXV)⋆
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, USA
8 IPNAS, Université de Liège, Sart Tilman 4000 Liège, Belgium
Accepted: 4 May 2019
Aims. In the context of accretion disks around black holes, we estimate plasma-environment effects on the atomic parameters associated with the decay of K-vacancy states in highly charged iron ions, namely Fe XVII – Fe XXV.
Methods. Within the relativistic multiconfiguration Dirac–Fock (MCDF) framework, the electron–nucleus and electron–electron plasma screenings were approximated with a time-averaged Debye–Hückel potential.
Results. Modified ionization potentials, K thresholds, wavelengths, radiative emission rates, and Auger widths are reported for astrophysical plasmas characterized by electron temperatures and densities in the ranges 105 − 107 K and 1018 − 1022 cm−3, respectively.
Conclusions. We conclude that the high-resolution microcalorimeters on board future X-ray missions such as XRISM and ATHENA are expected to be sensitive to the lowering of the iron K edge 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 5 and 6 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/qcat?J/A+A/626/A83.
© ESO 2019
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