微量热计时代的X射线能谱II：类氢铁和类氦铁中从A到B相变的柱密度的新诊断
X-ray spectroscopy in the microcalorimeter era II: A new Diagnostic on Column Density from the Case A to B Transition in H- and He-like Iron
摘要：
\textit{Hitomi}上的软X射线光谱仪（SXS）具有前所未有的R $\sim$ 1250分辨率，可以探测到英仙座星系团中心的Fe XXV \ka \复合发射光谱。在本文中，我们介绍了一种新的方法来测量柱密度使用光学薄（情况A）光学厚（情况B）的单电子和双电子系统的过渡。我们使用来自不同原子数据集的碰撞强度，将使用云计算的Fe XXV K $α$线比与英仙座核心外部区域的\textit{Hitomi}观测结果进行比较，并获得了良好的一致性。我们还显示了湍流的影响Fe XXV K $α$线比和柱密度和金属丰度之间的相互作用。此外，我们还讨论了允许跃迁和不允许跃迁的跃迁几率与原子序数的关系，这种关系使得高电荷态的类He系统，如Fe XXV，表现出与He I完全不同的行为.
英文摘要：
The Soft X-ray Spectrometer (SXS) on board \textit{Hitomi}, with the unprecedented resolving power of R$\sim$1250, allowed the detection of members of the Fe XXV \ka\ complex emission spectra from the center of the Perseus Cluster. In this paper, we introduce a novel method of measuring the column density using the optically thin (Case A) to optically thick (Case B) transition for one- and two-electron systems. We compare the Fe XXV K$α$ line ratios computed with CLOUDY with that from the \textit{Hitomi} observations in the outer region of the Perseus core using collision strengths from different atomic datasets, and obtain good agreement. We also show the effect of turbulence on Fe XXV K$α$ line ratios and interplay between column density and metallicity. Besides, we discuss the atomic number dependence of transition probabilities for allowed and non-allowed transitions, which causes the highly charged He-like systems, such as Fe XXV, to behave fundamentally differently from He I.
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