disnht：根据分布柱密度对X射线吸收进行建模
disnht: modeling X-ray absorption from distributed column densities
摘要：
在包含变化的光学深度值的空间或时间尺度上收集和分析X射线光子需要关于光学深度分布的知识。在足够宽的光学深度分布的情况下，假设一个单一的列密度值会导致一个误导性的解释源的发射特性，名义上是它的光谱模型。我们提出了一个模型描述的星际介质吸收X射线光谱在中等能量分辨率，提取的空间或时间区域包含一组独立的列密度。吸收模型（命名为disnht）近似对数正态分布，并以表格形式显示。解决方案表和源代码是可用的，可以进一步推广或定制的任意光学深度分布所包含的提取区域。disnht吸收模型和它的一般化的解决方案，预计将是相关的，目前和即将到来的大角度尺度分析的扩散X射线发射，如从扩展伦琴调查与成像望远镜阵列（eROSITA）和未来的雅典娜任务。
英文摘要：
Collecting and analysing X-ray photons over either spatial or temporal scales encompassing varying optical depth values requires knowledge about the optical depth distribution. In the case of sufficiently broad optical depth distribution, assuming a single column density value leads to a misleading interpretation of the source emission properties, nominally its spectral model. We present a model description for the interstellar medium absorption in X-ray spectra at moderate energy resolution, extracted over spatial or temporal regions encompassing a set of independent column densities. The absorption model (named disnht) approximates the distribution with a lognormal one and is presented in table format. The solution table and source code are made available and can be further generalized or tailored for arbitrary optical depth distributions encompassed by the extraction region. The disnht absorption model presented and its generalized solution are expected to be relevant for present and upcoming large angular scale analyses of diffuse X-ray emission, such as the ones from the extended ROentgen Survey with an Imaging Telescope Array (eROSITA) and the future Athena missions.
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