标题： 软X射线/窄线区连接：单一光致电离介质？ 显示英文标题

标题： The soft X-ray/NLR connection: a single photoionized medium?

摘要： 我们展示了一个由 8 个近邻 Seyfert 2 星系组成的样本，这些星系由哈勃太空望远镜（HST）和钱德拉观测。 所有源都表现出软 X 射线发射，其扩展性和整体形态与 [OIII] 发射一致。 光谱分析表明，所有目标的软 X 射线发射可能主要由光电离气体主导。 这一结论得到了 Markarian 3 的 190 ks XMM-Newton/RGS 光谱的强烈支持，多种诊断工具确认该发射是由处于光电离平衡状态的气体产生，并且共振散射做出了重要贡献。 我们使用 CLOUDY 代码测试了一种简单的情景，其中相同的气体被核连续谱光电离，从而同时产生软 X 射线发射和 [OIII] 发射。 满足这两个分量观测比值的解存在，并要求密度随着半径大致按 $r^{-2}$ 减小，类似于窄线区通常发现的情况。 显示英文摘要

摘要： We present a sample of 8 nearby Seyfert 2 galaxies observed by HST and Chandra. All of the sources present soft X-ray emission which is coincident in extension and overall morphology with the [OIII] emission. The spectral analysis reveals that the soft X-ray emission of all the objects is likely to be dominated by a photoionized gas. This is strongly supported by the 190 ks combined XMM-Newton/RGS spectrum of Mrk3, which different diagnostic tools confirm as being produced in a gas in photoionization equilibrium with an important contribution from resonant scattering. We tested with the code CLOUDY a simple scenario where the same gas photoionized by the nuclear continuum produces both the soft X-ray and the [OIII] emission. Solutions satisfying the observed ratio between the two components exist, and require the density to decrease with radius roughly like $r^{-2}$, similarly to what often found for the Narrow Line Region.