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arXiv 1408.0789astro-ph.GA
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红外发光星系ESO 148- IG002的能量来源和动力学

The energy source and dynamics of infrared luminous galaxy ESO 148-IG002

Sarah Leslie, Jeffrey Rich, Lisa Kewley, Michael Dopita

摘要:

ESO 148-IG 002代表了星系演化的一个转变阶段,包含两个相距很近的星系,目前正在合并成一个星系。我们提出的积分场数据,这个星系从ANU宽视场光谱仪(WiFeS)。我们分析我们的积分场数据,使用光学线比地图和速度地图。我们应用活动星系核、星暴和激波模型研究了恒星形成、激波激发和活动星系核活动对这一关键合并阶段光辐射的相对贡献。我们发现ESO 148-IG 002具有平坦的金属丰度梯度,与最近的气体流入一致。我们将线发射图分成一个恒星形成区域,该区域具有低速色散,在空间上覆盖了整个系统,以及一个南部的高速色散区域,该区域具有相干速度模式,可以是旋转或活动星系核驱动的外流,几乎没有证据表明纯恒星形成。我们发现,这两个重叠的星系可以分离使用运动学信息,展示中等光谱分辨率积分场光谱的力量。

英文摘要:

ESO 148-IG002 represents a transformative stage of galaxy evolution, containing two galaxies at close separation which are currently coalescing into a single galaxy. We present integral field data of this galaxy from the ANU Wide Field Spectrograph (WiFeS). We analyse our integral field data using optical line ratio maps and velocity maps. We apply active galactic nucleus (AGN), star-burst and shock models to investigate the relative contribution from star-formation, shock excitation and AGN activity to the optical emission in this key merger stage. We find that ESO 148-IG002 has a flat metallicity gradient, consistent with a recent gas inflow. We separate the line emission maps into a star forming region with low velocity dispersion that spatially covers the whole system as well as a southern high velocity dispersion region with a coherent velocity pattern which could either be rotation or an AGN-driven outflow, showing little evidence for pure star formation. We show that the two overlapping galaxies can be separated using kinematic information, demonstrating the power of moderate spectral resolution integral field spectroscopy.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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