论文标题

NGC 613 -II的核区域。运动学和恒星考古学

The nuclear region of NGC 613 -- II. Kinematics and stellar archaeology

论文作者

da Silva, Patrícia, Menezes, R. B., Steiner, J. E.

论文摘要

在这项工作中,我们继续研究了Da Silva等人对NGC 613的中部地区的研究。 (2020),通过分析光学和近红外数据立方体中的恒星和气体运动学以及恒星考古学。双子座多对象光谱仪(GMOS)数据立方体的高空间分辨率允许使用光谱合成方法检测到内核环,其半径为$ \ sim $ 1 Arcsec,由$ \ sim $ \ sim $ \ sim $ 10 $^9 $^9 $ y-yr stellar stellar stellar spellar群体组成。这样的环位于原子核和由先前工作中检测到​​的H II区组成的环形环之间。除此之外,核周围还有一个出色的旋转,环沿着不同速度的旋转方向沿着相同的方向。中心的强度加权平均恒星速度分散剂为92 $ \ pm $ 3 km S $^{ - 1} $。检测到三个不同的气体流出组件。与H $α$发射线观察到的流出方向与先前观察到的无线电射流的方向兼容。在[O III] $λ$ 5007发射中检测到的流出之一的方向与电离锥的轴相吻合。沿双恒星发射的恒星种群和恒星运动学没有差异,这可能是纸条I所述的尘埃道,证实它们是相同结构的一部分。

In this work, we continue the study of the central region of NGC 613 by da Silva et al. (2020), by analysing the stellar and gas kinematics and the stellar archaeology in optical and near-infrared data cubes. The high spatial resolution of the Gemini Multi-Object Spectrograph (GMOS) data cube allowed the detection, using spectral synthesis methods, of an inner circumnuclear ring, with a radius of $\sim$ 1 arcsec, composed of $\sim$ 10$^9$-yr stellar populations. Such a ring is located between the nucleus and the circumnuclear ring composed by H II regions detected in previous works. Besides that, there is a stellar rotation around the nucleus and the rings follow the same direction of rotation with different velocities. The intensity-weighted average stellar velocity dispersion at the centre is 92 $\pm$ 3 km s$^{-1}$. Three distinct gas outflow components were detected. The direction of the outflow observed with the H $α$ emission line is compatible with the direction of the previously observed radio jet. The direction of one of the outflows detected in the [O III]$λ$5007 emission coincides with the axis of the ionization cone. There is no difference regarding the stellar populations and the stellar kinematics along the double stellar emission, probably separated by a dust lane as mentioned in Paper I, confirming that they are part of the same structure.

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