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首页> 外文期刊>Chinese Journal of Astronomy and Astrophysics >Merger Dynamics of the Pair of Galaxy Clusters— A399 and A401
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Merger Dynamics of the Pair of Galaxy Clusters— A399 and A401

机译：一对银河星团A399和A401的合并动力学

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摘要

Convincing evidence for a past interaction between the two rich clusters A399 and A401 was recently found in the X-ray imaging observations. We examine the structure and dynamics of this pair of galaxy clusters. A mixture-modeling algorithm was applied to obtain a robust partition into two clusters, which allowed us to discuss the virial mass and velocity distribution of each cluster. Assuming that these two clusters follow a linear orbit and they have once experienced a close encounter, we model the binary cluster as a two-body system. As a result, four gravitationally bound solutions are obtained. The recent X-ray observations seem to favor a scenario in which the two clusters with a true separation of 5.4h~(-1) Mpc are currently expanding at 583 km s~(-1) along a direction with a projection angle of 67.5°, and they will reach a maximum extent of 5.65 h~(-1) Mpc in about 1.0 h~(-1) Gyr.
机译：最近在X射线成像观察中发现了两个富集A399和A401之间过去相互作用的令人信服的证据。我们研究了这对星系团的结构和动力学。应用混合建模算法将鲁棒分区划分为两个簇，这使​​我们能够讨论每个簇的病毒质量和速度分布。假设这两个星团遵循线性轨道，并且曾经经历过近距离相遇，我们将二元星团建模为一个两体系统。结果，获得了四个重力约束溶液。最近的X射线观察似乎更倾向于这样一种场景，其中两个真正间隔为5.4h〜（-1）Mpc的星团目前正在以投射角67.5的方向以583 km s〜（-1）扩展°，并且它们将在约1.0 h〜（-1）Gyr中达到5.65 h〜（-1）Mpc的最大范围。

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