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New measurement resolves key astrophysical Fe XVII oscillator strength problem

One of the most enduring and intensively studied problems of x-ray astronomy is the disagreement of state-of-the art theory and observations for the intensity ratio of two Fe XVII transitions of crucial value for plasma diagnostics, dubbed 3C and 3D. We unravel this conundrum at the PETRA III synchr...

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Hauptverfasser: Kühn, Steffen (VerfasserIn) , Cheung, Charles (VerfasserIn) , Oreshkina, Natalia S. (VerfasserIn) , Steinbrügge, René (VerfasserIn) , Togawa, Moto (VerfasserIn) , Bernitt, Sonja (VerfasserIn) , Berger, Lukas (VerfasserIn) , Buck, Jens (VerfasserIn) , Hoesch, Moritz (VerfasserIn) , Seltmann, Jörn (VerfasserIn) , Trinter, Florian (VerfasserIn) , Keitel, Christoph H. (VerfasserIn) , Kozlov, Mikhail G. (VerfasserIn) , Porsev, Sergey G. (VerfasserIn) , Gu, Ming Feng (VerfasserIn) , Porter, F. Scott (VerfasserIn) , Pfeifer, Thomas (VerfasserIn) , Leutenegger, Maurice A. (VerfasserIn) , Harman, Zoltán (VerfasserIn) , Safronova, Marianna S. (VerfasserIn) , Crespo López-Urrutia, José Ramon (VerfasserIn) , Shah, Chintan (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 5 December 2022
In: Physical review letters
Year: 2022, Jahrgang: 129, Heft: 24, Pages: 1-8
ISSN:1079-7114
DOI:10.1103/PhysRevLett.129.245001
Online-Zugang:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevLett.129.245001
Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevLett.129.245001
Volltext
Verfasserangaben:Steffen Kühn, Charles Cheung, Natalia S. Oreshkina, René Steinbrügge, Moto Togawa, Sonja Bernitt, Lukas Berger, Jens Buck, Moritz Hoesch, Jörn Seltmann, Florian Trinter, Christoph H. Keitel, Mikhail G. Kozlov, Sergey G. Porsev, Ming Feng Gu, F. Scott Porter, Thomas Pfeifer, Maurice A. Leutenegger, Zoltán Harman, Marianna S. Safronova, José R. Crespo López-Urrutia, Chintan Shah
Beschreibung
Zusammenfassung:One of the most enduring and intensively studied problems of x-ray astronomy is the disagreement of state-of-the art theory and observations for the intensity ratio of two Fe XVII transitions of crucial value for plasma diagnostics, dubbed 3C and 3D. We unravel this conundrum at the PETRA III synchrotron facility by increasing the resolving power 2.5 times and the signal-to-noise ratio thousandfold compared with our previous work. The Lorentzian wings had hitherto been indistinguishable from the background and were thus not modeled, resulting in a biased line-strength estimation. The present experimental oscillator-strength ratio Rexp=f3C/f3D=3.51(2)stat(7)sys agrees with our state-of-the-art calculation of Rth=3.55(2), as well as with some previous theoretical predictions. To further rule out any uncertainties associated with the measured ratio, we also determined the individual natural linewidths and oscillator strengths of 3C and 3D transitions, which also agree well with the theory. This finally resolves the decades-old mystery of Fe XVII oscillator strengths.
Beschreibung:Gesehen am 08.12.2022
Beschreibung:Online Resource
ISSN:1079-7114
DOI:10.1103/PhysRevLett.129.245001

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