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Ion storage ring measurements of dielectronic recombination for astrophysically relevant Fe~(q+) ions

机译:与天体相关的Fe〜(q +)离子的双电子复合的离子存储环测量

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Iron ions provide many valuable plasma diagnostics for cosmic plasmas. The accuracy o f these diagnostidcs, however, often depends on an accurate understanding of the ionization structure of the emitting gas. Dielectronic recombination (DR) is the dominant electron-ioon recombination mechanism for most iron ions in cosmic plasmas. Using the heavy-ion storage ring at the Max-Planck-Institute for Nuclear Physics in heidelberg, Germany, we have measured the low temperature DR rates for Fe~(q+) where q chemical bounds 15, 17, 18, and 19. These rates are important for photoionized gases which form in the media surrounding active galactic nuclei, X-ray binaries, and cataclysmic variables. Our results demonstrate that commonly used theoretical approximations for calculatig low temperatire DR rates can easily under-or over-estimate the DR rate by a factor of approx 2 or more. As essentially all DR rates used for modeling photoionized gases are calculated using these approximations, our results indicate that new DR rates are needed for almost all charge states of ccosmically abundant elements. Measurements are underway for other charge states of iron.
机译:铁离子为宇宙等离子体提供了许多有价值的等离子体诊断方法。但是,这些诊断的准确性通常取决于对发射气体电离结构的准确理解。对于宇宙等离子体中的大多数铁离子,双电子复合(DR)是主要的电子-离子复合机制。使用德国海德堡马克斯-普朗克核物理研究所的重离子存储环,我们测量了Fe〜(q +)的低温DR速率,其中q的化学界为15、17、18和19。这些速率对于在活跃的银河核,X射线双星和催化变量周围的介质中形成的光电离气体很重要。我们的结果表明,用于计算低气质DR率的常用理论近似值很容易将DR率低估或高估大约2倍或更多。由于基本上所有用于建模电离气体的DR速率都是使用这些近似值来计算的,因此我们的结果表明,对于宇宙丰富元素的几乎所有电荷状态,都需要新的DR速率。其他铁电荷状态的测量正在进行中。

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