VINTERGATAN-GM: 由大质量GSE类合并诱导的长寿命卫星平面
VINTERGATAN-GM: long-lived satellite planes induced by a massive GSE-like merger
AI总结：
研究通过高分辨率模拟探讨大质量GSE类合并如何导致卫星平面形成，发现更高质量的合并产生更平面化和动力学更一致的卫星群体。
摘要：
本研究通过VINTERGATAN-GM模拟发现，大质量GSE类合并导致卫星平面形成。更高质量的合并产生更平面化和动力学更一致的卫星群体。特别是合并质量比大于1:6的模拟中，卫星沿共同轴共轨，形成持续的动态持久平面。这些结构源于足够质量的合并沿拉格朗日体积最大压缩方向吸积，产生扁平宿主晕和与合并方向对齐的各向异性速度分散。合并使宿主晕的次要轴与周围宇宙网的扁平化方向对齐，卫星平面通过两种互补过程形成：(i) 卫星优先沿宿主赤道面落体；(ii) 非球形晕中的各向异性动态摩擦逐渐重塑轨道向该平面，产生一致且持久的平面配置。
英文摘要：
Satellite galaxies in the Local Group tend to be distributed in thin, planar configurations, with many sharing coherent orbital motion. Galaxy formation simulations in $Λ$CDM have historically struggled to produce similar structures, leading to the so-called "planes of satellites problem". In this work, we investigate whether the emergence of such structures is connected to the mass of a major merger at $z\sim2$, analogous to the Gaia-Sausage-Enceladus (GSE) event in the Milky Way. We use the VINTERGATAN-GM suite of high-resolution zoom-in simulations, comprising five realizations of the same Milky Way-mass halo generated through targeted genetic modifications of a GSE progenitor. The GSE-like merger mass ratio is systematically varied from 1:10 to 1:2.1, while keeping the final dynamical mass and large-scale environment fixed. We find a clear and consistent trend: more massive GSE-like mergers lead to satellite populations that are both more planar and more kinematically coherent. In particular, simulations with merger mass ratios larger than 1:6 develop Kinematic Persistent Planes (KPPs), in which at least 40% of satellites co-orbit around a common axis over extended periods, comparable to those observed in the Milky Way. These structures arise when sufficiently massive mergers, accreted along the direction of maximum compression of the Lagrangian volume, produce flattened host halos with anisotropic velocity dispersions aligned with the merger direction. The merger aligns the host halo's minor axis with the direction of flattening of the surrounding cosmic web, and planes of satellites then emerge through two complementary processes: (i) satellites preferentially infall along the host's equatorial plane, and (ii) anisotropic dynamical friction in the non-spherical halo gradually reshapes their orbits toward this plane, generating coherent and long-lived planar configurations.
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