期刊
PHYSICAL REVIEW LETTERS
卷 129, 期 24, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.129.245001
关键词
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资金
- Max-Planck-Gesellschaft (MPG)
- Bundesministerium fuer Bildung und Forschung (BMBF) [05K13SJ2]
- NASA
- NASA's Astrophysics Program
- US NSF [PHY-2012068]
- European Research Council (ERC) under the European Union [856415]
- Russian Science Foundation [19-12-00157]
- University of Delaware
- European Research Council (ERC) [856415] Funding Source: European Research Council (ERC)
This study reveals the intensity ratio issue of Fe XVII transitions in x-ray astronomy and resolves the previous mystery by increasing the resolving power and signal-to-noise ratio.
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 R-exp = f(3C)/f(3D) = 3.51(2()stat)(7)(sys) agrees with our state-of-the-art calculation of R-th = 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.
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