New Measurement Resolves Key Astrophysical Fe XVII Oscillator Strength Problem

被引：23

作者：

Kuhn, Steffen ^{[1
,2
]}

Cheung, Charles ^{[3
]}

Oreshkina, Natalia S. ^{[1
]}

Steinbruegge, Rene ^{[4
]}

Togawa, Moto ^{[1
]}

Bernitt, Sonja ^{[1
,5
,6
,7
]}

Berger, Lukas ^{[1
]}

Buck, Jens ^{[8
]}

Hoesch, Moritz ^{[4
]}

Seltmann, Joern ^{[4
]}

Trinter, Florian ^{[9
,10
]}

Keitel, Christoph H. ^{[1
]}

Kozlov, Mikhail G. ^{[11
]}

Porsev, Sergey G. ^{[3
]}

Gu, Ming Feng ^{[12
]}

Porter, F. Scott ^{[13
]}

Pfeifer, Thomas ^{[1
]}

Leutenegger, Maurice A. ^{[13
]}

Harman, Zoltan ^{[1
]}

Safronova, Marianna S.

Lopez-Urrutia, Jose R. Crespo ^{[1
]}

Shah, Chintan ^{[1
,13
]}

机构：

[1] Max Planck Inst Kernphys, Saupfercheckweg 1, D-69117 Heidelberg, Germany

[2] Heidelberg Univ, Heidelberg Grad Sch Fundamental Phys, Neuenheimer Feld 226, D-69120 Heidelberg, Germany

[3] Univ Delaware, Dept Phys & Astron, Newark, DE 19716 USA

[4] Deutsch Elektronen Sychrotron DESY, Notkestr 85, D-22607 Hamburg, Germany

[5] Friedrich Schiller Univ Jena, Inst Opt & Quantenelekt, Max Wien Pl 1, D-07743 Jena, Germany

[6] Helmholtz Inst Jena, Frobelstieg 3, D-07743 Jena, Germany

[7] GSI Helmholtzzentrum Schwerionenforsch, Planckstr 1, D-64291 Darmstadt, Germany

[8] Christian Albrechts Univ Kiel, Inst Expt & Angew Phys IEAP, Leibnizstr 11-19, D-24098 Kiel, Germany

[9] Goethe Univ Frankfurt Main, Inst Kernphys, Max Von Laue Str 1, D-60438 Frankfurt, Germany

[10] Fritz Haber Inst Max Planck Gesells, Mol Phys, Faradayweg 4-6, D-14195 Berlin, Germany

[11] St Petersburg Electrotech Univ LETI, Prof Popovstr 5, St Petersburg 197376, Russia

[12] Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA

[13] NASA, Goddard Space Flight Ctr, 8800 Greenbelt Rd, Greenbelt, MD 20771 USA

来源：

PHYSICAL REVIEW LETTERS | 2022年 / 129卷 / 24期

基金：

欧洲研究理事会; 俄罗斯科学基金会;

关键词：

REFLECTION GRATING SPECTROMETER; X-RAY OBSERVATIONS; LABORATORY MEASUREMENTS; ATOMIC DATA; RELATIVE INTENSITY; EMISSION; SOLAR; DENSITY; CHANDRA; LINES;

D O I：

10.1103/PhysRevLett.129.245001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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.

引用

页数：8

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