论文标题
NGC 4151核中的好奇活性：射流相互作用会导致变异性吗？
The curious activity in the nucleus of NGC 4151: jet interaction causing variability?
论文作者
论文摘要
许多活性银河核（AGN）的关键特征是它们的变异性，但其起源知之甚少，尤其是在无线电结构域中。威廉姆斯等人。 （2017年）报告说，在1.5 GHz时，E-Merlin阵列在Seyfert Galaxy NGC 4151中AGN的峰值通量密度增加了约50％。我们在5 GHz处提出了新的高分辨率电子杂志观测值，并将其与档案Merlin观测值进行比较以研究报告的可变性。我们的新观察结果使我们能够以比以前的E-Merlin研究高的分辨率探测核区域的三倍。我们将核心组件C4分离为三个单独的组件：C4W，C4E和X。AGN被认为位于组件C4W中，但是该组件在不确定性内的时代之间保持恒定。但是，我们发现，最早的组件C4E已从19.35 $ \ pm $ 1.10 $ \ $ \ 37.09 $ \ pm $ 1.86 mjy/beam上升，代表Merlin观测值的8.2 Sigma。我们将这种峰值密度增加归因于射流和发射线区域（ELR）之间的持续相互作用，这是在低亮度AGN（例如NGC 4151）中首次观察到的。我们在沿射流轴上鉴定了5 GHz处的离散分辨率分量，我们将其解释为JET-ELR Retaction的区域。
A key characteristic of many active galactic nuclei (AGN) is their variability, but its origin is poorly understood, especially in the radio domain. Williams et al. (2017) reported a ~50 per cent increase in peak flux density of the AGN in the Seyfert galaxy NGC 4151 at 1.5 GHz with the e-MERLIN array. We present new high resolution e-MERLIN observations at 5 GHz and compare these to archival MERLIN observations to investigate the reported variability. Our new observations allow us to probe the nuclear region at a factor three times higher-resolution than the previous e-MERLIN study. We separate the core component, C4, into three separate components: C4W, C4E and X. The AGN is thought to reside in component C4W, but this component has remained constant between epochs within uncertainties. However, we find that the Eastern-most component, C4E, has increased in peak flux density from 19.35$\pm$1.10 to 37.09$\pm$1.86 mJy/beam, representing a 8.2 sigma increase on the MERLIN observations. We attribute this peak flux density increase to continued interaction between the jet and the emission line region (ELR), observed for the first time in a low-luminosity AGN such as NGC 4151. We identify discrete resolved components at 5 GHz along the jet axis, which we interpret as areas of jet-ELR interaction.
