标题： 高速场与星系群相互作用在NGC 7769、7770、7771和7771A四重星系中的研究 显示英文标题

标题： Ha Velocity Fields and Galaxy Interaction in the Quartet of Galaxies NGC 7769, 7770, 7771 and 7771A

摘要： 七扎星系组 NGC 7769、7770、7771 和 7771A 是一个相互作用的星系系统。 星系之间的紧密相互作用产生了特征性的形态特征：潮汐臂和棒状结构，以及诱发的恒星形成。 在这项研究中，我们对这个系统的氢谱线进行了法布里-珀罗扫描干涉测量，并研究了星系的速度场。 我们发现 NGC 7769 的旋转曲线仅有轻微扭曲。 NGC 7771 的旋转曲线因 NGC 7769 的直接飞掠及其较小邻居 NGC 7770 的飞掠而强烈扭曲。 由于与质量更大的 NGC 7771 相互作用，NGC 7770 的旋转曲线显著偏斜。 旋转曲线和形态扰动表明，NGC 7769 和 NGC 7771 已经通过了第一次近心点阶段，但可能尚未发生第二次相遇。 NGC 7769 的表面亮度分布具有明显的转折点，颜色指数分布则在由与 NGC 7771 相互作用诱发的密集恒星形成的半径处达到最小值。 显示英文摘要

摘要： The quartet of galaxies NGC 7769, 7770, 7771 and 7771A is a system of interacting galaxies. Close interaction between galaxies caused characteristic morphological features: tidal arms and bars, as well as an induced star formation. In this study, we performed the Fabry-Perot scanning interferometry of the system in Ha line and studied the velocity fields of the galaxies. We found that the rotation curve of NGC 7769 is weakly distorted. The rotation curve of NGC 7771 is strongly distorted with the tidal arms caused by direct flyby of NGC 7769 and flyby of a smaller neighbor NGC 7770. The rotation curve of NGC 7770 is significantly skewed because of the interaction with the much massive NGC 7771. The rotation curves and morphological disturbances suggest that the NGC 7769 and NGC 7771 have passed the first pericenter stage, however, probably the second encounter has not happened yet. Profiles of surface brightness of NGC 7769 have a characteristic break, and profiles of color indices have a minimum at a radius of intensive star formation induced by the interaction with NGC 7771.