卫星星系运动学持续平面的起源：由局部宇宙网在$\Lambda$CDM中的早期演化驱动
The origin of kinematically-persistent planes of satellite galaxies as driven by the early evolution of the local Cosmic Web in $Λ$CDM
AI总结：
本研究通过宇宙学模拟揭示，卫星星系运动学持续平面（KPPs）的形成源于局部宇宙网早期演化，其轨道极与拉格朗日体积主方向对齐，由$\hat{e}_3$结构坍缩驱动，为$\Lambda$CDM框架下卫星平面起源提供动力学解释。
摘要：
运动学持续卫星平面（KPPs）是围绕宿主星系共轨的固定卫星集合，其轨道极在长时间宇宙尺度上得以保持并聚集。它们扮演着“骨架”的角色，确保位置平面的长期稳定性。我们以局部宇宙网（CW）的动力学为背景，探讨了其形成背后的物理过程，该动力学通过所谓的拉格朗日体积（LVs）来表征，这些体积围绕两个放大（zoom-in）宇宙学流体模拟的MW质量盘星系+卫星系统构建，其中已识别出三个KPP。通过分析LVs在约化惯性张量（TOI）方面的形变，我们发现LV主方向与KPP卫星的轨道极之间存在显著对齐。最强烈的压缩性局部质量流（沿$\hat{e}_3$特征向量）在早期很强，为所谓的$\hat{e}_3$结构提供物质，而最小的TOI轴迅速减小。$\hat{e}_3$结构的坍缩标志着这一阶段的结束，也是当宇宙年龄$\lesssim$ 40亿年时卫星轨道极聚集建立的时间尺度。与$\hat{e}_3$对齐的KPP原卫星，其轨道极要么从早期就对齐，要么在$\hat{e}_3$结构坍缩时成功弯曲。与$\hat{e}_1$相关的KPP卫星往往在早期轨迹就与$\hat{e}_3$平行。我们表明，KPPs可能是$\Lambda$CDM预测的大尺度动力学作用于特定原卫星集合的结果，这些动力学同样塑造了局部CW环境。
英文摘要：
Kinematically-persistent planes of satellites (KPPs) are fixed sets of satellites co-orbiting around their host galaxy, whose orbital poles are conserved and clustered across long cosmic time intervals. They play the role of 'skeletons', ensuring the long-term durability of positional planes. We explore the physical processes behind their formation in terms of the dynamics of the local Cosmic Web (CW), characterized via the so-called Lagrangian Volumes (LVs) built up around two zoom-in, cosmological hydro-simulations of MW-mass disk galaxy + satellites systems, where three KPPs have been identified. By analyzing the LVs deformations in terms of the reduced Tensor of Inertia (TOI), we find an outstanding alignment between the LV principal directions and KPP satellites' orbital poles. The most compressive local mass flows (along the $\hat{e}_3$ eigenvector) are strong at early times, feeding the so-called $\hat{e}_3$-structure, while the smallest TOI axis rapidly decreases. The $\hat{e}_3$-structure collapse marks the end of this regime and is the timescale for the establishment of satellite orbital pole clustering when the Universe is $\lesssim$ 4 Gyr old. KPP proto-satellites aligned with $\hat{e}_3$ are those whose orbital poles are either aligned from early times, or have been successfully bent at $\hat{e}_3$-structure collapse. KPP satellites associated to $\hat{e}_1$ tend to have early trajectories already parallel to $\hat{e}_3$. We show that KPPs can arise as a result of the $Λ$CDM-predicted large-scale dynamics acting on particular sets of proto-satellites, the same dynamics that shape the local CW environment.
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