New Measurement Resolves Key Astrophysical Fe XVII Oscillator Strength Problem
| Autor: | 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 |
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| Přispěvatelé: | Kühn, Steffen, Shah, Chintan |
| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: |
High Energy Astrophysical Phenomena (astro-ph.HE)
Atomic Physics (physics.atom-ph) Research group Z. Harman – Division C. H. Keitel Research group N. S. Oreshkina – Division C. H. Keitel FOS: Physical sciences General Physics and Astronomy Astrophysics - Astrophysics of Galaxies Physics - Plasma Physics Physics - Atomic Physics Plasma Physics (physics.plasm-ph) Astrophysics - Solar and Stellar Astrophysics Astrophysics of Galaxies (astro-ph.GA) ddc:530 Astrophysics - High Energy Astrophysical Phenomena Solar and Stellar Astrophysics (astro-ph.SR) |
| Zdroj: | Physical Review Letters Physical review letters 129(24), 245001 (2022). doi:10.1103/PhysRevLett.129.245001 |
| DOI: | 10.15120/gsi-2022-00990 |
| Popis: | Physical review letters 129(24), 245001 (2022). doi:10.1103/PhysRevLett.129.245001 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. Published by APS, College Park, Md. |
| Databáze: | OpenAIRE |
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