SAMI星系巡天：Abell 119星系相互作用和运动学异常
The SAMI galaxy survey: Galaxy Interactions and Kinematic Anomalies in Abell 119
摘要：
星系合并是一个重要的事件，它可以通过改变星系的形态、恒星形成活动和质量增长来决定星系的命运。合并系统通常被确定从他们的扰动形态，我们现在可以使用积分场光谱检测和分析合并对恒星运动学的影响。我们视觉分类星系形态使用深图像（$μ_{\rm r} = 28\,\rm mag\,\, arcsec^{-2}$）采取的布兰科4米望远镜在塞罗托洛洛美洲天文台。本文研究了Abell 119中63个亮（$M_{\rm r}<-19.3$）星系的光谱选择性，其中53个是早期型星系，20个星系的目视观察显示出扰动的形态。在形态扰动的星系中，光度图像和运动学图中的主轴之间的不对准是明显的。我们的样本主要是早期类型的星系，但它显示了一个令人惊讶的紧密塔利-费舍尔关系，除了形态扰动的星系，显示大的偏差。在我们的样本中，八个慢旋转体中有三个是形态紊乱的。视觉上选择的形态扰动星系通常在视觉上和运动学上都更不对称。我们的研究结果表明，星系的相互作用，包括合并，也许飞，在确定星系的角动量的方向和大小发挥了重要作用。
英文摘要：
Galaxy mergers are important events that can determine the fate of a galaxy by changing its morphology, star-formation activity and mass growth. Merger systems have commonly been identified from their disturbed morphologies, and we now can employ Integral Field Spectroscopy to detect and analyze the impact of mergers on stellar kinematics as well. We visually classified galaxy morphology using deep images ($μ_{\rm r} = 28\,\rm mag\,\, arcsec^{-2}$) taken by the Blanco 4-m telescope at the Cerro Tololo Inter-American Observatory. In this paper we investigate 63 bright ($M_{\rm r}<-19.3$) spectroscopically-selected galaxies in Abell 119; of which 53 are early type and 20 galaxies show a disturbed morphology by visual inspection. A misalignment between the major axes in the photometric image and the kinematic map is conspicuous in morphologically-disturbed galaxies. Our sample is dominated by early-type galaxies, yet it shows a surprisingly tight Tully-Fisher relation except for the morphologically-disturbed galaxies which show large deviations. Three out of the eight slow rotators in our sample are morphology disturbed. The visually-selected morphologically-disturbed galaxies are generally more asymmetric, visually as well as kinematically. Our findings suggest that galaxy interactions, including mergers and perhaps fly-bys, play an important role in determining the orientation and magnitude of galaxy's angular momentum.
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