SCG0018-4854：一个年轻而充满活力的紧凑型集团I.运动学分析
SCG0018-4854: a young and dynamic compact group I. Kinematical analysis
摘要：
致密的星系群由于其高密度和低速度的分散性，特别是研究星系相互作用及其对星系演化的影响的良好实验室。SCG 0018 -4854是一个密度极高、速度极低的星系群，有证据显示最近有过相互作用。我们获得了VLT FORS 2光学观测，我们提出了显着的星系相互作用如何影响四个成员星系的光谱和光度证据。我们发现了每个星系独特的运动学和最近恒星形成的证据。特别是，两个星系的气体和恒星径向速度曲线是不规则的，不对称程度类似于其他相互作用的星系。我们发现了NGC 92的一个横杠，因此修正了以前的形态分类，我们获得了NGC 89星系尺度外流的光谱确认。特殊的运动学和动力学考虑导致最新相互作用的年龄的粗略估计：0.2-0.7 Gyr，这表明SCG 0018 -4854是一个年轻和动态的群体。
英文摘要：
Compact groups of galaxies are in particular good laboratories for studying galaxy interactions and their effects on the evolution of galaxies due to their high density and low velocity dispersion. SCG0018-4854 is a remarkably high galaxy density and low velocity dispersion group with evidence of a recent interaction. We obtained VLT FORS2 optical observations and we present spectroscopic and photometric evidence of how dramatically galaxy interactions have affected each of the four member galaxies. We found peculiar kinematics for each galaxy and evidence of recent star formation. In particular, the gas and stellar radial velocity curves of two galaxies are irregular with a level of asymmetry similar to that of other interacting galaxies. We discovered the presence of a bar for NGC 92 therefore revising a previous morphological classification and we obtained spectroscopic confirmation of a galactic-scale outflow of NGC 89. Peculiar kinematics and dynamic consideration lead to a rough estimate of the age of the latest interaction: 0.2-0.7 Gyr, suggesting that SCG0018-4854 is a young and dynamical group.
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