标题： 星团形成过程中次结构的演化 显示英文标题

标题： The Evolution of Substructure during Star Cluster Assembly

摘要： 星团的形成和组装发生在丝状和湍流分子云内部，这在年轻的星团中留下了空间和运动学上的子结构。 在本文中，我们量化了包含气体辐射磁流体动力学演化的星团形成模拟中的这种子结构的数量及其演化，并结合详细的恒星动力学、双星形成和演化以及恒星反馈。 我们发现，在早期阶段同时存在空间和运动学子结构。 随着新恒星的形成以及子星团的合并，星团的组装过程会消除这两种子结构。 空间子结构在大约初始自由落体时间的2.5倍时间内被消除。 运动学子结构持续时间更长，在我们的模拟结束时仍然存在。 我们还在模拟中寻找早期动力学质量分选的证据，并得出结论，即存在一个双星种群可以加速和增强质量分选过程。 显示英文摘要

摘要： Star cluster formation and assembly occurs inside filamentary and turbulent molecular clouds, which imprints both spatial and kinematic substructure on the young cluster. In this paper, we quantify the amount and evolution of this substructure in simulations of star cluster formation that include radiation magnetohydrodynamical evolution of the gas, coupled with detailed stellar dynamics, binary formation and evolution, and stellar feedback. We find that both spatial and kinematic substructure are present at early times. Both are erased as the cluster assembles through the formation of new stars as well as the merger of sub-clusters. Spatial substructure is erased over a timescale of approximately 2.5 times the initial free-fall time of the cloud. Kinematic substructure persists for longer, and is still present to the end of our simulations. We also explored our simulations for evidence of early dynamical mass segregation, and conclude that the presence of a population of binary stars can accelerate and enhance the mass segregation process.