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arXiv 1406.5528astro-ph.GA
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射电喷流驱动外流的三维性质和能量学

The Three Dimensional Properties and Energetics of Radio Jet Driven Outflows

Hsin-Yi Shih, Alan Stockton

摘要:

在射电强源周围发现的扩展发射线区域(EELRs)可能是由一种强大的活动星系核反馈机制驱动的外流。在这项研究中,我们试图限制三维气体性质和流出能量的EELRs。我们使用一个积分场单元观测了两个射电强活动星系核样本周围的EELR,这两个样本具有相似的射电性质,但方向不同:一个类星体样本和一个射电星系样本。形态学的比较表明,三维EELR气体分布的情况下,粗双锥形状与宽开角。EELR的平均范围为$\sim 18.5$ kpc。在合理假设气体密度的情况下,EELR的估计平均质量为$\sim 3 \times 10^8$ M $_\odot$,平均质量流出率为$\sim 30$ M $_\odot$/年。类星体和射电星系周围的EELR具有相似的运动学性质。这两个样品的速度结构,显示了一系列的复杂性,他们似乎不相关的射流方向,都跨越了类似的速度分散范围。大约30%的EELRs显示出大尺度的旋转运动,这可能是最近的合并涉及到富含气体的盘星系。

英文摘要:

Extended emission-line regions (EELRs), found around radio loud sources, are likely outflows driven by one form of powerful AGN feedback mechanism. We seek to constrain the three-dimensional gas properties and the outflow energetics of the EELRs in this study. We used an integral field unit to observe EELRs around two samples of of radio loud AGNs with similar radio properties but different orientations: a sample of quasars and a sample of radio galaxies. A morphological comparison suggests a scenario where the three-dimensional EELR gas distribution follows rough biconical shapes with wide opening angles. The average extent of the EELRs is $\sim 18.5$ kpc. The estimated average mass of the EELRs, with reasonable assumptions for gas densities, is $\sim 3 \times 10^8$ M$_\odot$, and the average mass outflow rate is $\sim 30$ M$_\odot$/yr. The EELRs around quasars and radio galaxies share similar kinematic properties. Both samples have velocity structures that display a range of complexities and they do not appear to correlate with the jet orientations, and both span a similar range of velocity dispersions. Around 30\% of the detected EELRs show large scale rotational motions, which may have originated from recent mergers involving gas-rich disk galaxies.

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