Long-term evolution of multimass rotating star clusters
Long-term evolution of multimass rotating star clusters
复制标题
多质量旋转星团的长期演化
DOI：
10.1093/mnras/stac651
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发表时间：
2022
影响因子：
4.8
通讯作者：
Livernois A
中科院分区：
文献类型：
--
作者：
Livernois A
研究了多质量旋转星星团内部运动学的长期动力学演化。我们已经进行了一组ofN体模拟遵循内部演化的集群与不同程度的初始旋转，并探讨了演化的旋转速度，能量均分的程度，和各向异性的速度分布。模拟结果表明：（1）随着星系团的演化，质量越大的恒星自转速度越快，自转曲线上的峰值越靠近星系团中心;（2）星系团内外区的能量均分程度取决于速度色散分量;（3）大质量恒星速度分布的各向异性较强，（4）质量分凝和能量均分的程度都具有空间各向异性的特征;他们有一个依赖于bothRandz，与扁平化的集群的密度和速度分散的空间变化，如所示的质量分离和能量均分的（R-z）的双曲平面上的二维地图。
We investigate the long-term dynamical evolution of the internal kinematics of multimass rotating star clusters. We have performed a set ofN-body simulations to follow the internal evolution of clusters with different degrees of initial rotation and have explored the evolution of the rotational velocity, the degree of energy equipartition, and anisotropy in the velocity distribution. Our simulations show that (1) as the cluster evolves, the rotational velocity develops a dependence on the stellar mass with more massive stars characterized by a more rapid rotation and a peak in the rotation curve closer to the cluster centre than low-mass stars; (2) the degree of energy equipartition in the cluster’s intermediate and outer regions depends on the component of the velocity dispersion measured; for more rapidly rotating clusters, the evolution towards energy equipartition is more rapid in the direction of the rotational velocity; (3) the anisotropy in the velocity distribution is stronger for massive stars; and (4) both the degree of mass segregation and energy equipartition are characterized by spatial anisotropy; they have a dependence on bothRandz, correlated with the flattening in the spatial variation of the cluster’s density and velocity dispersion, as shown by 2D maps of the mass segregation and energy equipartition on the (R–z) meridional plane.