New Measurement Resolves Key Astrophysical Fe XVII Oscillator Strength Problem
| Author(s) | Kühn, Steffen | |
| Author(s) | Cheung, Charles | |
| Author(s) | Oreshkina, Natalia S. | |
| Author(s) | Steinbrügge, René | |
| Author(s) | Togawa, Moto | |
| Author(s) | Bernitt, Sonja | |
| Author(s) | Berger, Lukas | |
| Author(s) | Buck, Jens | |
| Author(s) | Hoesch, Moritz | |
| Author(s) | Seltmann, Jörn | |
| Author(s) | Trinter, Florian | |
| Author(s) | Keitel, Christoph H. | |
| Author(s) | Kozlov, Mikhail G. | |
| Author(s) | Porsev, Sergey G. | |
| Author(s) | Gu, Ming Feng | |
| Author(s) | Porter, F. Scott | |
| Author(s) | Pfeifer, Thomas | |
| Author(s) | Leutenegger, Maurice A. | |
| Author(s) | Harman, Zoltán | |
| Author(s) | Safronova, Marianna S. | |
| Author(s) | López-Urrutia, José R. Crespo | |
| Author(s) | Shah, Chintan | |
| Date Accessioned | 2023-03-09T20:24:38Z | |
| Date Available | 2023-03-09T20:24:38Z | |
| Publication Date | 2022-12-05 | |
| Description | This article was originally published in Physical Review Letters. The version of record is available at: https://doi.org/10.1103/PhysRevLett.129.245001 | |
| Abstract | 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. | |
| Sponsor | Financial support was provided by the Max-Planck-Gesellschaft (MPG) and Bundesministerium für Bildung und Forschung (BMBF) through Project No. 05K13SJ2. C. S. acknowledges support by an appointment to the NASA Postdoctoral Program at the NASA Goddard Space Flight Center, administered by Oak Ridge Associated Universities under contract with NASA and by Max-Planck-Gesellschaft (MPG). F. S. P. and M. A. L. acknowledge support from NASA’s Astrophysics Program. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of the National Aeronautics and Space Administration (NASA) or the U.S. Government. The U.S. Government is authorized to reproduce and distribute reprints for government purposes notwithstanding any copyright notation herein. The theoretical research was supported in part by US NSF Grant No. PHY-2012068, European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (Grant Agreement No. 856415), the Russian Science Foundation under Grant No. 19-12-00157, and through the use of Caviness and DARWIN HPC systems at the University of Delaware [105]. We acknowledge DESY (Hamburg, Germany), a member of the Helmholtz Association HGF, for the provision of experimental facilities. Parts of this research were carried out at PETRA III. We thank Jens Viefhaus and Rolf Follath for valuable discussions on x-ray monochromator resolution and performance, and the synchrotron-operation team and P04 team at PETRA III for their skillful and reliable work. We also thank anonymous referees whose comments and suggestions helped improve and clarify this manuscript. | |
| Citation | Kühn, Steffen, Charles Cheung, Natalia S. Oreshkina, René Steinbrügge, Moto Togawa, Sonja Bernitt, Lukas Berger, et al. “New Measurement Resolves Key Astrophysical Fe XVII Oscillator Strength Problem.” Phys. Rev. Lett. 129, no. 24 (December 2022): 245001. https://doi.org/10.1103/PhysRevLett.129.245001. | |
| ISSN | 1079-7114 | |
| URL | https://udspace.udel.edu/handle/19716/32401 | |
| Language | en_US | |
| Publisher | Physical Review Letters | |
| Title | New Measurement Resolves Key Astrophysical Fe XVII Oscillator Strength Problem | |
| Type | Article |
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