Journal ArticleDOI
Diagnostic Utility of the Relative Intensity of 3C to 3D in Fe XVII
TLDR
In this paper, the relative intensity of the resonance and intercombination line in neon-like Fe XVII, located at 15.01 and 15.26 A, respectively, has been measured at the Lawrence Livermore National Laboratory electron beam ion trap EBIT-II as a function of the relative abundance of Fe XVI.Abstract:
The relative intensity R of the resonance and intercombination line in neon-like Fe XVII, located at 15.01 and 15.26 A, respectively, has been measured at the Lawrence Livermore National Laboratory electron beam ion trap EBIT-II as a function of the relative abundance of sodium-like Fe XVI. Our measurements identify several Fe XVI lines and one Fe XV line in this region. We show that an Fe XVI inner shell satellite line coincides with the intercombination line and can significantly reduce the apparent R. We measure R = 1.90 ± 0.11 when the relative abundance of Fe XVI to Fe XVII is ~1. This explains the anomalously low ratios observed in the solar and stellar coronae. The fact that the apparent relative intensity of the resonance and intercombination line in Fe XVII is sensitive to the strength of an Fe XVI inner shell satellite, and therefore, the relative abundance of Fe XVI to Fe XVII, makes the line ratio a diagnostic of temperature.read more
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Updated Atomic Data and Calculations for X-Ray Spectroscopy
TL;DR: AtomDB 2.0.2 as discussed by the authors is a database of atomic data and a plasma modeling code with a focus on X-ray astronomy, including new ionization balance data, state-selective recombination data, and updated collisional excitation data for many ions, including the iron L-shell ions from Fe+16 to Fe+23 and all of the hydrogen- and helium-like sequences.
Journal ArticleDOI
Indirect X-Ray Line-Formation Processes in Iron L-Shell Ions
TL;DR: In this paper, the role of indirect processes in the soft X-ray line formation of iron L-shell ions, using a newly developed, relativistic, multiconfigurational atomic package, was investigated.
Journal ArticleDOI
Updated Atomic Data and Calculations for X-ray Spectroscopy
TL;DR: AtomDB 2.0.2 as mentioned in this paper is a database of atomic data and a plasma modeling code with a focus on X-ray astronomy, which includes several major updates to the fundamental atomic structure and process data held within AtomDB, incorporating new ionization balance data, state-selective recombination data, and updated collisional excitation data for many ions.
Journal ArticleDOI
High Resolution Observations of the Elliptical Galaxy NGC 4636 with the Reflection Grating Spectrometer On-Board XMM-Newton
Haiguang Xu,Steven M. Kahn,John R. Peterson,Ehud Behar,F. B. S. Paerels,R. F. Mushotzky,J. G. Jernigan,Kazuo Makishima +7 more
TL;DR: In this article, the authors presented the first high spectral resolution X-ray observation of the giant elliptical galaxy NGC 4636, obtained with the Reflection Grating Spectrometer on-board the XMM-Newton Observatory.
Journal ArticleDOI
High-Resolution Observations of the Elliptical Galaxy NGC 4636 with the Reflection Grating Spectrometer on Board XMM-Newton
Haiguang Xu,S. M. Kahn,John R. Peterson,Ehud Behar,F. B. S. Paerels,R. F. Mushotzky,J. G. Jernigan,A. C. Brinkman,Kazuo Makishima +8 more
TL;DR: In this article, the authors presented the first high spectral resolution X-ray observation of the giant elliptical galaxy NGC 4636, obtained with the reflection grating spectrometer on board the XMM-Newton Observatory.
References
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Journal ArticleDOI
X-Ray Interactions: Photoabsorption, Scattering, Transmission, and Reflection at E = 50-30,000 eV, Z = 1-92
TL;DR: In this article, the atomic scattering factors for all angles of coherent scattering and at the higher photon energies are obtained from these tabulated forward-scattering values by adding a simple angle-dependent form-factor correction.
Journal ArticleDOI
Iron ionization and recombination rates and ionization equilibrium
M. Arnaud,J. Raymond +1 more
TL;DR: In this article, a critical review of the existing data on ionization and dielectronic recombination and present new computations of radiative recombination rate coefficients of Fe(+14) through Fe(−25) using the photoionization cross sections of Clark et al.
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Energy Level and Line Tables for One-Electron Atomic Spectra*
J. D. Garcia,J. E. Mack +1 more
TL;DR: In this paper, the energy levels and lines of the spectra 1H i to 40Ca xx according to an equation expected to exhibit a relative uncertainty of the order of 10−11Z7.
Journal ArticleDOI
First light measurements of Capella with the low-energy transmission grating spectrometer aboard the Chandra X-ray observatory
A. C. Brinkman,C. J. T. Gunsing,Jelle Kaastra,R. L. J. van der Meer,R. Mewe,Frits Paerels,A. J. J. Raassen,J. J. van Rooijen,Heinrich Bräuninger,Wolfgang Burkert,Vadim Burwitz,Gisela Hartner,Peter Predehl,Jan-Uwe Ness,J. H. M. M. Schmitt,Jeremy J. Drake,O. Johnson,Michael Juda,V. Kashyap,Stephen S. Murray,Deron O. Pease,Peter W. Ratzlaff,Bradford J. Wargelin +22 more
TL;DR: The first X-ray spectrum obtained by the Low-Energy Transmission Grating Spectrometer (LETGS) aboard the Chandra X-Ray Observatory is presented and plasma parameters derived from line ratios in narrow spectral bands are discussed.
Journal ArticleDOI
High-Resolution X-Ray Spectra of Capella: Initial Results from the Chandra High-Energy Transmission Grating Spectrometer
Claude R. Canizares,David P. Huenemoerder,David S. Davis,Daniel Dewey,Kathryn A. Flanagan,John C. Houck,Thomas H. Markert,Herman L. Marshall,Mark L. Schattenburg,Norbert S. Schulz,Michael W. Wise,Jeremy J. Drake,Nancy Brickhouse +12 more
TL;DR: In this article, high-resolution spectra of the active binary Capella (G8 III + G1 III) covering the energy range of 0.4-8.0 keV (1.5-30 A) show a large number of emission lines, demonstrating the performance of the High Energy Transmission Grating Spectrometer.