z < 0.3时3CR射电星系的扩展软X射线辐射：高激发和宽线星系
Extended soft X-ray emission in 3CR radio galaxies at z < 0.3: High Excitation and Broad Line Galaxies
摘要：
我们分析钱德拉观测到的漫射软X射线发射与一个完整的样本的3CR射电星系在z < 0.3。本文主要研究高激发星系（HEGs）和宽线天体（BLOs）的光谱子类的性质。在33个高能量气体中，我们检测到约40%的源中的扩展（或可能扩展）发射;该分数甚至更高（8/10），将分析限制在曝光时间大于10 ks的物体上。在18个BLO中，仅在2个物体中看到了扩展发射;这种较低的检测率可以归因于它们明亮的X射线核的存在，这些核很容易超过任何真正的扩散发射。软X射线和光学线形态之间出现了非常密切的对应关系。我们还发现，[O III]和扩展的软X射线光度之间的比率被限制在一个因素2左右的中值为5。这两个结果都类似于在塞弗特星系中看到的。我们讨论了不同的过程，可以解释软X射线发射，并得出结论，扩展气体的光电离，符合窄线区域，是有利的机制。
英文摘要：
We analyze Chandra observations of diffuse soft X-ray emission associated with a complete sample of 3CR radio galaxies at z < 0.3. In this paper we focus on the properties of the spectroscopic sub-classes of high excitation galaxies (HEGs) and broad line objects (BLOs). Among the 33 HEGs we detect extended (or possibly extended) emission in about 40% of the sources; the fraction is even higher (8/10) restricting the analysis to the objects with exposure times larger than 10 ks. In the 18 BLOs, extended emission is seen only in 2 objects; this lower detection rate can be ascribed to the presence of their bright X-ray nuclei that easily outshine any genuine diffuse emission. A very close correspondence between the soft X-ray and optical line morphology emerges. We also find that the ratio between [O III] and extended soft X-ray luminosity is confined within a factor of 2 around a median value of 5. Both results are similar to what is seen in Seyfert galaxies. We discuss different processes that could explain the soft X-ray emission and conclude that the photoionization of extended gas, coincident with the narrow line region, is the favored mechanism.
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