NGC 4945的空间分辨铁钾光谱
Spatially resolved Fe K spectroscopy of NGC 4945
摘要：
我们提出的组合钱德拉ACIS-S观测的康普顿厚的塞弗特2星系NGC 4945的成像和光谱分析。我们对源的环核环境进行了空间分辨光谱学，描绘了高度吸收的原子核周围最里面的200秒差距。额外的200千克拉ACIS-S数据相对于以前的运动，使我们能够更详细地映射这个源的中心结构，并发现一个增强的铁排放在最里面的核区域，相对于相关的康普顿反射连续。我们发现，铁K $α$线的等效宽度是空间可变的（范围从0.5到3千电子伏），在几十秒差距的尺度上，可能是由于电离状态和取向的后处理材料的影响，相对于中央X射线照射源。一团高度电离的Fe XXV He- $α$也被探测到，在距离原子核以东40秒差距处。当观察采取相隔数年被认为是，中央未解决的反射发射被发现保持不变。
英文摘要：
We present the imaging and spectroscopic analysis of the combined Chandra ACIS-S observations of the Compton-thick Seyfert 2 galaxy NGC 4945. We performed a spatially-resolved spectroscopy of the circumnuclear environment of the source, picturing the innermost 200 parsecs around the highly absorbed nucleus. The additional 200 ks ACIS-S data with respect to the previous campaign allowed us to map with even greater detail the central structure of this source and to discover an enhanced iron emission in the innermost nuclear region, with respect to the associated Compton reflection continuum. We revealed that the Equivalent Width of the iron K$α$ line is spatially variable (ranging from 0.5 to 3 keV), on scales of tens of parsecs, likely due to the ionization state and orientation effects of the reprocessing material, with respect to the central X-ray illuminating source. A clump of highly ionized Fe XXV He-$α$ is also detected, 40 parsecs east to the nucleus. When observations taken years apart are considered, the central unresolved reflected emission is found to remain constant.
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