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一个意想不到的低振荡器强度是Fe XVII排放问题的起源
S Bernitt1, G V Brown, J K Rudolph
1Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany. sven.bernitt@mpi-hd.mpg.de
Nature
|December 14, 2012
概括
高电荷铁 (Fe XVII) 的X射线线对天体物理学至关重要,但模拟不佳. 新的实验揭示了出乎意料的低振荡器强度,表明原子物理,而不是等离子体条件,导致天体物理学观测中的差异.
科学领域:
- 天体物理等离子体物理学物理学
- 原子物理 原子物理
- X射线天文学X射线天文学
背景情况:
- 高电荷铁 (Fe XVII) 在热天体中产生明亮的X射线线.
- 观察到的Fe XVII光谱,特别是最强的线,与理论模型不匹配.
- 这种差异影响了像Chandra和XMM-Newton这样的X射线任务的解释.
研究的目的:
- 为了实验性地研究Fe XVII X射线发射背后的原子物理.
- 为了解决等离子体建模与天体物理谱中的原子物理学之间的争议.
- 准确确定关键Fe XVII线的相对振荡器强度.
主要方法:
- 利用来自自由电子激光器的秒X射线脉冲来诱导铁离子的光.
- 在受控条件下测量了铁离子的X射线发射光谱.
- 将实验结果与最先进的量子力学计算进行比较.
主要成果:
- 对一个关键的Fe XVII线的相对振荡器强度明显低于预测.
- 实验值偏离理论计算的3.6个标准偏差.
- 这一发现指出了模型中使用的基本原子波函数的问题.
结论:
- 天体物理观测和模型之间的差异很可能是由于原子物理计算中的不准确性.
- 具体来说,对高电荷离子的原子波函数的质量需要改进.
- 这项研究完善了我们对来自热天体物理等离子体的X射线辐射的理解.
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