Fe-L配合物II的X射线光谱：来自EBIT实验和Capella的X射线光栅观测的原子数据约束
X-ray spectra of the Fe-L complex II: atomic data constraints from EBIT experiment and X-ray grating observations of Capella
摘要：
Hitomi对英仙座星系团的研究结果表明，精确的原子模型对于X射线光谱任务的成功至关重要，与仪器校准和天体物理建模知识同样重要。准备模型需要多方面的方法，包括理论计算，实验室测量和使用实际观测进行校准。在以前的论文中，我们提出了一个电子碰撞截面的过渡形成的Fe-L复合物的计算。在目前的工作中，我们系统地测试对电子束离子阱实验中测得的离子的截面的计算。在电子束能量和X射线光子能量的二维分析是用来解开辐射通道后的双电子复合，直接电子碰撞激发，共振激发过程中的实验数据。通过实验室测量校准的数据被进一步输入到卡佩拉的钱德拉光栅光谱的全球建模。我们调查和比较的拟合质量，以及衍生的物理参数的敏感性的基础原子数据和天体物理等离子体建模。我们进一步列出了观测和目前计算之间的潜在分歧，这反过来又要求在理论计算和有针对性的实验室测量方面重新努力。
英文摘要：
The Hitomi results for the Perseus cluster have shown that accurate atomic models are essential to the success of X-ray spectroscopic missions, and just as important as knowledge on instrumental calibration and astrophysical modeling. Preparing the models requires a multifaceted approach, including theoretical calculations, laboratory measurements, and calibration using real observations. In a previous paper, we presented a calculation of the electron impact cross sections on the transitions forming the Fe-L complex. In the present work, we systematically test the calculation against cross sections of ions measured in an electron beam ion trap experiment. A two-dimensional analysis in the electron beam energies and X-ray photon energies is utilized to disentangle radiative channels following dielectronic recombination, direct electron-impact excitation, and resonant excitation processes in the experimental data. The data calibrated through laboratory measurements are further fed into global modeling of the Chandra grating spectrum of Capella. We investigate and compare the fit quality, as well as sensitivity of the derived physical parameters to the underlying atomic data and the astrophysical plasma modeling. We further list the potential areas of disagreement between the observation and the present calculations, which in turn calls for renewed efforts in theoretical calculations and targeted laboratory measurements.
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