AI 中文总结
本研究对NGC 1142的9次X射线观测数据进行$N_H$变异性分析，采用UXCLUMPY等环面模型建模，验证了$N_H$变异性相关趋势，为AGN环面/宽线区本质提供新约束。
AI 中文摘要
活动星系核（AGN）中心引擎周围气体和尘埃的物理性质、几何结构与运动学尚未被充分理解。在一些源中，这些物质会遮挡冕区X射线辐射，使得我们可以测量其视线方向的柱密度（$N_H$）。许多源在多个观测历元中表现出$N_H$变异性，研究这种变异性可获取遮挡物质的分布与动力学信息。此前研究表明，观测到$N_H$变异性的概率随可用观测次数增加而上升，且$N_H$变异性的观测幅度取决于观测间隔的时标。本研究对NGC 1142的$N_H$变异性展开分析，该源在约20年间共获得9次X射线观测，其中包括2024-2025年开展的NuSTAR+XMM-Newton监测项目的5次观测，相关内容为首次报道。我们采用具有物理依据的环面模型UXCLUMPY、XSKIRTor和RXTorusD对光谱进行建模，研究结果验证了此前观测到的趋势，并将这些趋势与假设不同遮挡云位置和分布的模拟遮挡曲线进行了对比。
英文摘要
The physics, geometry, and kinematics of the gas and dust surrounding the central engine of active galactic nuclei (AGN) are not well understood. In some sources, this material obscures the coronal X-ray emission, allowing its line-of-sight column density ($N_H$) to be measured. Many sources display $N_H$ variability across multiple epochs. Studying this variability can provide information about the distribution and dynamics of the obscuring material. Particularly, previous works have shown that the probability of observing $N_H$ variability increases with the number of observations available. Additionally, the observed magnitudes of the $N_H$ variability depend on the timescale between observations. In this work, we present the $N_H$ variability analysis of NGC 1142, which has a total of nine X-ray observations over $\sim20$ years, including five from a NuSTAR+XMM-Newton monitoring campaign performed in 2024-2025 and reported here for the first time. We use the physically-motivated torus models UXCLUMPY, XSKIRTor, and RXTorusD to model the spectra. Our results confirm the previously observed trends, and we compare these trends to simulated obscuration curves assuming different locations and distributions of obscuring clouds.
Comments17 pages, 5 figures, 4 tables, submitted to ApJ
