Early dynamics and violent relaxation of multimass rotating star clusters
Early dynamics and violent relaxation of multimass rotating star clusters
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DOI：
10.1093/mnras/stab2119
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发表时间：
2021-07
影响因子：
4.8
通讯作者：
A. Livernois;E. Vesperini;M. Tiongco;A. Varri;E. Dalessandro
中科院分区：
文献类型：
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作者：
A. Livernois;E. Vesperini;M. Tiongco;A. Varri;E. Dalessandro
我们提出了一项研究结果，旨在通过 N 体模拟探索在存在弱外部潮汐场的情况下剧烈弛豫阶段旋转多质量星团的演化。我们研究了初始旋转和质谱的存在对剧烈弛豫动力学的影响以及该阶段结束时出现的平衡的最终特性。我们的模拟显示了在剧烈弛豫阶段期间和结束时向空间质量偏析和向能量均分演化的清晰表现。我们研究了最终的旋转运动学，并表明大质量恒星往往比低质量恒星绕星团旋转轴旋转得更快。我们的分析还表明，在剧烈弛豫阶段，大质量恒星往往会优先分离到角动量与星团角动量一致的轨道上，这种效应之前在二体弛豫驱动的星团长期演化背景下发现。
We present the results of a study aimed at exploring, by means of N-body simulations, the evolution of rotating multimass star clusters during the violent relaxation phase, in the presence of a weak external tidal field. We study the implications of the initial rotation and the presence of a mass spectrum for the violent relaxation dynamics and the final properties of the equilibria emerging at the end of this stage. Our simulations show a clear manifestation of the evolution towards spatial mass segregation and evolution towards energy equipartition during and at the end of the violent relaxation phase. We study the final rotational kinematics and show that massive stars tend to rotate more rapidly than low-mass stars around the axis of cluster rotation. Our analysis also reveals that during the violent relaxation phase, massive stars tend to preferentially segregate into orbits with angular momentum aligned with the cluster’s angular momentum, an effect previously found in the context of the long-term evolution of star clusters driven by two-body relaxation.