Plasma-environment effects on K lines of astrophysical interest III. IPs, K thresholds, radiative rates, and Auger widths in Fe ix - Fe xvi

Abstract

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 (MCDF) method approximating the plasma electron-nucleus and electron-electron screenings with a time-averaged Debye-Huckel 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.

arXiv comment6 pages, 5 figures, to be published in A&A

References in corpus (17)

• Improved Reflection Models of Black-Hole Accretion Disks: Treating the Angular Distribution of X-rays
• X-ray reflected spectra from accretion disk models. III. A complete grid of ionized reflection calculations
• The Hot and Energetic Universe: A White Paper presenting the science theme motivating the Athena+ mission
• X-ray reflected spectra from accretion disk models. I. Constant density atmospheres
• The Spin of Supermassive Black Holes
• Global Radiation Magneto-hydrodynamic Simulations of Sub-Eddington Accretion Disks around Supermassive Black Holes
• Modeling of iron K lines: radiative and Auger decay data for Fe II-Fe IX
• Alternative explanations for extreme supersolar iron abundances inferred from the energy spectrum of Cygnus X-1
• High Density Reflection Spectroscopy: II. the Density of the Inner Black Hole Accretion Disc in AGN
• X-ray Spectra from MHD Simulations of Accreting Black Holes
• The Soft-Excess in Mrk 509: Warm Corona or Relativistic Reflection?
• Continuum Lowering -- A New Perspective
• High Density Reflection Spectroscopy I. A case study of GX~339-4
• Decay Properties of K-Vacancy States in Fe X-Fe XVII
• Reflection spectra from an accretion disc illuminated by a neutron star X-ray burst
• 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)
• An Empirical Method for Improving the Quality of RXTE HEXTE Spectra

Cited by in corpus (2)

• Photoionization Models for High Density Gas
• Plasma environment effects on K lines of astrophysical interest. V. Universal formulae for ionization potential and K-threshold shifts