J/A+A/643/A57 FeII-FeVIII K lines Plasma environment effects (Deprince+, 2020)
Plasma environment effects on K lines of astrophysical interest.
IV. IPs, K thresholds, radiative rates and Auger widths in Fe II - Fe VIII.
Deprince J., Bautista M.A., Fritzsche S., Garcia J., Kallman T.,
Mendoza C., Palmeri P., Quinet P.
<Astron. Astrophys. 643, A57 (2020)>
=2020A&A...643A..57D 2020A&A...643A..57D (SIMBAD/NED BibCode)
ADC_Keywords: Atomic physics
Keywords: black hole physics - plasmas - atomic data - X-rays: general
Abstract:
In the framework of compact-object accretion disks, we have calculated
plasma environment effects on the atomic structure and decay
parameters used in the modeling of the K lines in lowly charged iron
ions, namely FeII-FeVIII.
We use 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.
Modified ionization potentials, K-threshold energies, wavelengths,
radiative emission rates, and Auger widths are reported for plasmas
characterized by electron temperatures and densities in the ranges
105-107K and 1018-1022cm-3. In addition, we propose two
universal fitting formulae to predict the IP and K-thresold lowerings
in any elemental ion.
We conclude that the high-resolution X-ray spectrometers onboard the
future XRISM and ATHENA space missions will be able to detect the
lowering of the K edges of these Fe ions due to the extreme plasma
conditions occurring in accretion disks around compact objects.
Description:
Computed wavelengths, transition probabilities for three values of the
plasma screening parameter (mu) in iron ions from Fe II (Zeff=2) to Fe
VIII (Zeff=8) are given in this table. In Table 4 the iron ions are
identified by their effective charge (Zeff) and the transitions by
their identification (Trans). For each transition, the wavelengths and
the transition probabilities are given for mu = 0, 0.1 and 0.25 a.u.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 109 217 Wavelengths and transition probabilities
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See also:
J/A+A/626/A83 : FeXVII-XXV K lines plasma environment effects (Deprince+, 2019)
J/A+A/635/A70 : FeIX-XVI K lines plasma environment effects (Deprince+, 2020)
Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1 I1 --- Zeff Effective charge
3- 57 A55 --- Trans Transition identification
60- 65 F6.4 0.1nm WL1 Wavelength in Angstroem (mu = 0 a.u.)
67- 72 F6.4 0.1nm WL2 Wavelength in Angstroem (mu = 0.1 a.u.)
74- 79 F6.4 0.1nm WL3 Wavelength in Angstroem (mu = 0.25 a.u.)
81- 89 E9.3 s-1 Ar1 Transition probability (mu = 0 a.u.)
91- 99 E9.3 s-1 Ar2 Transition probability (mu = 0.1 a.u.)
101-109 E9.3 s-1 Ar3 Transition probability (mu = 0.25 a.u.)
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Acknowledgements:
Patrick Palmeri, patrick.palmeri(at)umons.ac.be
References:
Deprince et al., Paper I 2019A&A...624A..74D 2019A&A...624A..74D
Deprince et al., Paper II 2019A&A...626A..83D 2019A&A...626A..83D, Cat. J/A+A/626/A83
Deprince et al., Paper III 2020A&A...635A..70D 2020A&A...635A..70D, Cat. J/A+A/635/A70
(End) Patrick Palmeri [UMONS], Patricia Vannier [CDS] 16-Sep-2020