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Fe XVII 排出問題の起源として,予期せぬほど低い振動器の強さ
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
まとめ
高電荷の鉄 (Fe XVII) のX線は天体物理学にとって不可欠ですが,モデル化が不十分です. 新しい実験では,予想外の低振動器の強度が明らかになり,プラズマ状態ではなく原子物理が,天体物理学的観測の不一致の原因であることを示唆しています.
科学分野:
- 天体物理学 プラズマ物理学 プラズマ物理学
- 原子物理学 原子物理学とは
- X線天文学X線天文学とは
背景:
- 高電荷の鉄 (Fe XVII) は,熱い天体物理学的な物体の中で明るいX線を生成します.
- 観測されたFe XVIIスペクトル,特に最も強い線は,理論モデルと一致しません.
- この不一致は,チャンドラやXMM-ニュートンなどのX線ミッションからの解釈に影響を与えます.
研究 の 目的:
- Fe XVIIX線放射の基礎となる原子物理を実験的に調査する.
- プラズマモデリングと天体物理学スペクトルの原子物理学の間の論争を解決するために.
- FeXVIIキーラインの相対振動器の強さを正確に決定する.
主な方法:
- フリー電子レーザーからのフェムト秒のX線パルスを利用して,鉄イオンに光を誘発した.
- 制御された条件下で鉄イオンのX線放射スペクトルを測定した.
- 最先端の量子力学的計算で実験結果を比較した.
主要な成果:
- 主要なFe XVII線の相対振動器の強さが予測より著しく低いことを測定しました.
- 実験値は,理論的な計算から3.6標準偏差で偏ります.
- この発見は,モデルで使用される基本的な原子波関数に関する問題を指摘する.
結論:
- 天体物理学的観測とモデルの間の不十分な一致は,原子物理学の計算の不正確さによる可能性が高い.
- 具体的には,高電荷イオンに対する原子波動の質の改善が必要である.
- この研究は,熱い天体物理学プラズマからのX線放射の理解を洗練します.
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