Plasma environment effects on K lines of astrophysical interest
I. Atomic structure, radiative rates, and Auger widths of oxygen ions
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: 4 March 2019
Aims. In the context of black-hole accretion disks, the main goal of the present study is to estimate the plasma environment effects on the atomic structure and radiative parameters associated with the K-vacancy states in ions of the oxygen isonuclear sequence.
Methods. We used a time-averaged Debye–Hückel potential for both the electron–nucleus and the electron–electron interactions implemented in the fully relativistic multiconfiguration Dirac–Fock (MCDF) method.
Results. Modified ionization potentials, K thresholds, Auger widths, and radiative transition wavelengths and rates are reported for O I–O VII in plasma environments with electron temperature and density ranges 105−107 K and 1018−1022 cm−3.
Key words: black hole physics / plasmas / atomic data / X-rays: general
© ESO 2019