论文标题
Nustar Era VIII中的Compton-Thick AGN：换装外观康普顿厚的AGN NGC 1358的Nustar-XMM Newton联合监视
Compton-Thick AGN in the NuSTAR era VIII: A joint NuSTAR-XMM-Newton monitoring of the changing-look Compton-thick AGN NGC 1358
论文作者
论文摘要
We present the multi-epoch monitoring with NuSTAR and XMM-Newton of NGC 1358, a nearby Seyfert 2 galaxy whose properties made it a promising candidate X-ray changing look AGN, i.e., a source whose column density could transition from its 2017 Compton-thick (CT-, having line-of-sight Hydrogen column density NH,los>10^24 cm^-2) state to a Compton-thin （NH，Los <10^24 cm^-2）一个。多上述X射线监测证实，时间尺度上存在显着的NH，LOS变异性，并使我们能够确认NGC 1358的“外观变化”性质，而NGC 1358的“外观变化”性质最近在Compton-Phin-thin身份中观察到。证明使用Nustar和XMM-Newton进行多上述监测在同时约束三个高度退化参数方面非常有效：圆环平均柱密度和覆盖因子以及圆环轴和观察者之间的倾斜角。我们发现色谱柱密度和光度之间的暂定抗相关性，可以在混乱的冷积聚云的框架中理解，以驱动递归AGN的反馈。 NGC 1358的监测活动证明了我们新开发的方法的效率，以选择候选NH，LOS-Varia-able，light Mucked AGN，我们计划很快将其扩展到更大的样本，以更好地表征围绕超级杂物黑洞的遮盖物质的特性，并限制AGN喂食模型。
We present the multi-epoch monitoring with NuSTAR and XMM-Newton of NGC 1358, a nearby Seyfert 2 galaxy whose properties made it a promising candidate X-ray changing look AGN, i.e., a source whose column density could transition from its 2017 Compton-thick (CT-, having line-of-sight Hydrogen column density NH,los>10^24 cm^-2) state to a Compton-thin (NH,los<10^24 cm^-2) one. The multi-epoch X-ray monitoring confirmed the presence of significant NH,los variability over time-scales as short as weeks, and allowed us to confirm the "changing look" nature of NGC 1358, which has most recently been observed in a Compton-thin status. Multi-epoch monitoring with NuSTAR and XMM-Newton is demonstrated to be highly effective in simultaneously constraining three otherwise highly degenerate parameters: the torus average column density and covering factor, and the inclination angle between the torus axis and the observer. We find a tentative anti-correlation between column density and luminosity, which can be understood in the framework of Chaotic Cold Accretion clouds driving recursive AGN feedback. The monitoring campaign of NGC 1358 has proven the efficiency of our newly developed method to select candidate NH,los-variable, heavily obscured AGN, which we plan to soon extend to a larger sample to better characterize the properties of the obscuring material surrounding accreting supermassive black holes, as well as constrain AGN feeding models.
