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亮红外星系中多重合并的自适应光学成像和光谱学

Adaptive optics imaging and optical spectroscopy of a multiple merger in a luminous infrared galaxy

P. Vaisanen, S. Mattila, A. Kniazev, A. Adamo, A. Efstathiou, D. Farrah, P. H. Johansson, G. Ostlin, D. A. H. Buckley, E. B. Burgh, L. Crause, Y. Hashimoto, P. … 展开作者

P. Vaisanen, S. Mattila, A. Kniazev, A. Adamo, A. Efstathiou, D. Farrah, P. H. Johansson, G. Ostlin, D. A. H. Buckley, E. B. Burgh, L. Crause, Y. Hashimoto, P. Lira, N. Loaring, K. Nordsieck, E. Romero-Colmenero, S. Ryder, M. Still, A. Zijlstra

摘要:

本文介绍了用VLT/NACO获得的近红外(NIR)自适应光学成像和南部非洲大望远镜(SALT)对一个亮红外星系(LIRG)IRAS 19115-2124的光谱分析。这些数据与档案HST成像和斯皮策成像和光谱学相结合,使我们能够非常详细地研究这个被称为鸟的干扰相互作用/合并星系。特别是,数据揭示了一个三重系统,其中LIRG现象是由最小的组件占主导地位。一个核是一个规则的棒旋,具有显着的旋转,而另一个是高度干扰的表面亮度分布中间的磁盘和凸起系统,并暗示剩余的臂/酒吧结构。我们推导出这两个星系的动力学质量在3- 7 × 10^10 M_solar范围内。第三个组成部分似乎是一个1- 2 × 10^10 M_太阳质量的不规则星系。整个系统表现出HII星系般的光学线比和强度,并没有证据的活动星系核活动被发现从光学或中红外数据。恒星形成速率估计为190 M_solar/yr。我们寻找SNe,超级星团,并检测到100-300公里/秒的气体流出鸟。总体而言,鸟显示运动学,动力学和发射线的性质典型的冷超亮红外星系。然而,使它在未来研究中脱颖而出的有趣特征是它的三重合并性质,以及它的恒星形成峰值的位置-最强的恒星形成不是来自两个主要的K带核,而是来自第三个不规则成分。借助于模拟,我们讨论的情况下,不规则的组件是在其第一次高速遇到更大规模的组件。

英文摘要:

(abridged) We present near-infrared (NIR) adaptive optics imaging obtained with VLT/NACO and optical spectroscopy from the Southern African Large Telescope (SALT) of a luminous infrared galaxy (LIRG) IRAS 19115-2124. These data are combined with archival HST imaging and Spitzer imaging and spectroscopy, allowing us to study this disturbed interacting/merging galaxy, dubbed the Bird, in extraordinary detail. In particular, the data reveal a triple system where the LIRG phenomenon is dominated by the smallest of the components. One nucleus is a regular barred spiral with significant rotation, while another is highly disturbed with a surface brightness distribution intermediate to that of disk and bulge systems, and hints of remaining arm/bar structure. We derive dynamical masses in the range 3-7x10^10 M_solar for both. The third component appears to be a 1-2x10^10 M_solar mass irregular galaxy. The total system exhibits HII galaxy-like optical line ratios and strengths, and no evidence for AGN activity is found from optical or mid-infrared data. The star formation rate is estimated to be 190 M_solar/yr. We search for SNe, super star clusters, and detect 100-300 km/s outflowing gas from the Bird. Overall, the Bird shows kinematic, dynamical, and emission line properties typical for cool ultra luminous IR galaxies. However, the interesting features setting it apart for future studies are its triple merger nature, and the location of its star formation peak - the strongest star formation does not come from the two major K-band nuclei, but from the third irregular component. Aided by simulations, we discuss scenarios where the irregular component is on its first high-speed encounter with the more massive components.

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