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N-BODY SIMULATION OF THE STEPHAN'S QUINTET

机译:史蒂芬五重奏的N体模拟

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The evolution of compact groups of galaxies may represent one of the few places in the nearby universe in which massive galaxies are being forged through a complex set of processes involving tidal interaction, ram-pressure stripping, and perhaps finally "dry mergers" of galaxies stripped of their cool gas. Using collisionless N-body simulations, we propose a possible scenario for the formation of one of the best-studied compact groups: Stephan's Quintet. We define a serial approach which allows us to consider the history of the group as a sequence of galaxy-galaxy interactions seen as relatively separate events in time, but chained together in such a way as to provide a plausible scenario that ends in the current configuration of the galaxies. By covering a large set of parameters, we claim that it is very unlikely that both major tidal tails of the group have been created by the interaction between the main galaxy and a single intruder. We propose instead a scenario based on two satellites orbiting the main disk, plus the recent involvement of an additional interloper, coming from the background at high speed. This purely N-body study of the quintet will provide a parameter-space exploration of the basic dynamics of the group that can be used as a basis for a more sophisticated N-body/hydrodynamic study of the group that is necessary to explain the giant shock structure and other purely gaseous phenomena observed in both the cold, warm and hot gas in the group.
机译:紧密的星系群的演化可能代表了附近宇宙中为数不多的几个地方之一,在这些地方中,大量的星系通过一系列复杂的过程进行了锻造,这些过程涉及潮汐相互作用,冲压压力剥离以及可能最终被剥离的星系“干合并”他们的凉气。使用无碰撞N体模拟,我们提出了一种可能的方案,以形成研究最深入的紧凑型组之一:斯蒂芬五重奏组。我们定义了一种串行方法,该方法使我们可以将组的历史视为一系列星系-星系相互作用,被视为时间上相对独立的事件,但是以提供以当前配置结尾的合理场景的方式链接在一起星系。通过涵盖大量参数,我们声称该组的两个主要潮汐尾极不可能是由主要星系和单个入侵者之间的相互作用产生的。取而代之,我们提出了一种方案,该方案基于围绕主磁盘运行的两颗卫星,以及最近从后台高速介入的另外一个闯入者的介入。此五重奏组的纯N体研究将提供对该组基本动力学的参数空间探索,可作为对该组进行更复杂的N体/流体动力学研究的基础,这对于解释该巨人是必要的在该组的冷,热和热气体中都观察到了冲击结构和其他纯气体现象。

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