论文标题
潮汐剥离系统演变的通用模型
A universal model for the evolution of tidally stripped systems
论文作者
论文摘要
暗物质亚李子的结构演变的准确模型，因为它们在较大系统中轨道轨道，这对于了解当今的暗物质的详细分布至关重要。 Subhalo进化的数值模拟支持了以下观点：与潮汐剥离相关的质量损失在能量空间中最自然地理解，而粒子首先被删除。从这个前提开始，我们最近提出了一个零参数的“能量截断模型”，以用于Subhalo Evolution。我们通过使用初始NFW曲线的卫星剥离进行了模拟测试了该模型，并表明能量截断模型准确地预测了质量损失和密度曲线。在这项工作中，我们将模型应用于各种Hernquist，Einasto和King Profiles。我们表明，在所有情况下，它都与模拟结果非常匹配，这表明它可以用作描述潮汐剥离的无碰撞系统的通用模型。能量截断模型的一个关键预测是，由于质量失去质量，暗物质subhoes的中心密度是保守的。这对暗物质歼灭计算以及对暗物质的其他观察测试具有重要意义。
Accurate models of the structural evolution of dark matter subhaloes, as they orbit within larger systems, are fundamental to understanding the detailed distribution of dark matter at the present day. Numerical simulations of subhalo evolution support the idea that the mass loss associated with tidal stripping is most naturally understood in energy space, with the particles that are the least bound being removed first. Starting from this premise, we recently proposed a zero-parameter "energy-truncation model" for subhalo evolution. We tested this model with simulations of tidal stripping of satellites with initial NFW profiles, and showed that the energy-truncation model accurately predicts both the mass loss and density profiles. In this work, we apply the model to a variety of Hernquist, Einasto and King profiles. We show that it matches the simulation results quite closely in all cases, indicating that it may serve as a universal model to describe tidally stripped collisionless systems. A key prediction of the energy-truncation model is that the central density of dark matter subhaloes is conserved as they lose mass; this has important implications for dark matter annihilation calculations, and for other observational tests of dark matter.
