论文标题
低光度AGN中的积聚和喷气机：NGC 1052的核
Accretion and jets in a low luminosity AGN: the nucleus of NGC 1052
论文作者
论文摘要
我们旨在使用X射线和无线电数据来确定NGC 1052的中央区域的性质。 NGC 1052（Z = 0.005）已在不同的能带中研究了数十年，并显示了无线电裂片和低光度活性银河核（LLAGN）。我们使用Chandra的X射线图像和来自非常大阵列（VLA）的无线电图像来探索中心区域的形态。我们还使用Chandra和XMM-Newton的观察结果研究了细胞核和周围区域的光谱。我们发现沿无线电裂片的弥漫性软X射线辐射和热点。热等离子体（T〜0.6 keV）和具有光子指数γ〜2.3的功率定律很好地描述了环核区域的光谱。核显示通过复杂吸收修饰的硬幂定律（γ〜1.4）。在所有观察结果中也清楚地发现了狭窄的铁K-α线，但是没有相对论反射的证据。扩展的发射与源自延长的喷气机和周围介质中的喷气触发冲击相一致。核中的硬幂律发射和缺乏相对论反射支持了以对流为主的积聚流（ADAF）中效率低下的积聚的情况。
We aim to determine the properties of the central region of NGC 1052 using X-ray and radio data. NGC 1052 (z=0.005) has been investigated for decades in different energy bands and shows radio lobes and a low luminosity active galactic nucleus (LLAGN). We use X-ray images from Chandra and radio images from Very Large Array (VLA) to explore the morphology of the central area. We also study the spectra of the nucleus and the surrounding region using observations from Chandra and XMM-Newton. We find diffuse soft X-ray radiation and hotspots along the radio lobes. The spectrum of the circum-nuclear region is well described by a thermal plasma (T~0.6 keV) and a power law with photon index Gamma~2.3. The nucleus shows a hard power law (Gamma~1.4) modified by complex absorption. A narrow iron K-alpha line is also clearly detected in all observations, but there is no evidence for relativistic reflection. The extended emission is consistent with originating from extended jets and from jet-triggered shocks in the surrounding medium. The hard power-law emission from the nucleus and the lack of relativistic reflection supports the scenario of inefficient accretion in an Advection Dominated Accretion Flow (ADAF).
