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arXiv 2007.07932astro-ph.GA
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NGC 1068中的两级流出

A two-stage outflow in NGC 1068

D. May, J. E. Steiner

摘要:

我们提出了一个分析的塞弗特2星系NGC 1068与档案数据从SINFONI-VLT,在HK波段的像素尺度为0.1(数据集1 -DS 1)和0.025(DS 2)角秒。对数据进行了复杂的数据处理,如差分大气折射校正和应用巴特沃兹滤波和反褶积。在这个过程中的增益是量化的显着改善的Strehl比,它表明,前所未有的高空间分辨率的实现。对于DS 1,H $_{2}$、[Fe II]和[Si VI]发射线的详细研究揭示了三相气体形态:(1)代表沙漏结构的辉光壁的低速[Fe II]发射,(2)充满沙漏体积的低电离和高电离发射的高速致密团块,以及(3)H $_{2}$分子气体的分布限定了围绕空腔的气泡的厚且不规则的壁。沙漏和分子发射都有一个不对称性,这是由东北分子壁的破碎造成的,最接近活动星系核,导致气泡外高速致密的电离气体团块。气泡的西南部被射流挖开,在那里,气泡仍然被限制并沿着气泡的内边界被吹走。我们认为,这些斑点是由来自喷流相互作用并将其能量注入分子气体的地方的热“二次风”驱动的。由中心源发射的一次风和二次风的结合就是我们所说的两级外流。对于DS 2,我们检测到一个[Si VI]流出近共面的微波激射盘和正交的CO流出发现以前的研究。这种意想不到的情况被解释为中心辐射场和两相气体密度环之间的相互作用。

英文摘要:

We present an analysis of the Seyfert 2 galaxy NGC 1068 with archive data from SINFONI-VLT, in the HK bands with pixel scales of 0.1 (data set 1 - DS1) and 0.025 (DS2) arcsec. The data are revisited with a sophisticated data treatment, such as the differential atmospheric refraction correction and the application of a Butterworth filtering and deconvolution. The gain in the process is quantified by a significant improvement in the Strehl ratio and it shows that an unprecedented high spatial resolution is achieved. For DS1, a detailed study of the H$_{2}$, [Fe II] and [Si VI] emission lines reveals a three-phase gas morphology: (1) the low-velocity [Fe II] emission representing the glowingwall of an hourglass structure, (2) the high-velocity compact blobs of low and high ionization emissions filling the hourglass volume and (3) the distribution of H$_{2}$ molecular gas defines the thick and irregular walls of a bubble surrounding a cavity. Both the hourglass and the molecular emissions have an asymmetry caused by the fragmentation of the north-eastern molecular wall, closest to the active galactic nucleus, resulting in highvelocity compact blobs of ionized gas outside the bubble. The south-western part of the bubble is excavated by the jet, where the blobs remain confined and are blown along the bubble's inner boundary. We propose that those blobs are driven by a hot "secondary wind" coming from the spot where the jet interacts and injects its energy in the molecular gas. The combination of a primary wind launched by the central source and the secondary wind is what we call a two-stage outflow. For DS2, we detected a [Si VI] outflow nearly coplanar to the maser disc and orthogonal to the CO outflow found by a previous study. Such unexpected scenario is interpreted as the interaction between the central radiation field and a two-phase gas density torus.

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