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arXiv 2003.09452astro-ph.GAastro-ph.CO
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潮汐剥离系统中的质量损失;基于能量的截断法

Mass loss in tidally stripped systems; the energy-based truncation method

Nicole E. Drakos, James E. Taylor, Andrew J. Benson

备注：
20 pages, 14 figures, accepted to MNRAS
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摘要：

准确预测潮汐剥离晕演化的能力对于理解星系形成和测试暗物质的性质具有重要意义。大多数子结构演化的研究都是基于潮汐质量损失的经验模型进行预测的，这些模型是使用数值模拟进行校准的。这种方法在所考虑的情况下可能是准确的，但缺乏一般性，不能提供对所涉及过程的物理理解。最近，我们证明了截断NFW分布函数急剧的能量结果的密度分布，类似于潮汐剥离系统，提供了一个路径，以构建物理动机的模型潮汐质量损失。在这项工作中，我们审查计算的质量损失的能量截断的基础上，然后考虑什么二次效应可能调制质量损失超出此。我们发现，一个组合的依赖于额外的轨道参数和变化的单个粒子的能量在一个轨道上的结果在一个不太突然截断的能量空间作为subhalo失去质量。结合能量截断的方法与一个简单的预测的质量损失率，我们构建了一个完整的模型的质量损失，可以准确地预测一个subhalo的演变的一个单一的参数$η_{\rm eff}$。这个参数可以完全从初始轨道和晕属性确定，并且不需要用数值模拟进行校准。

英文摘要：

The ability to accurately predict the evolution of tidally stripped haloes is important for understanding galaxy formation and testing the properties of dark matter. Most studies of substructure evolution make predictions based on empirical models of tidal mass loss that are calibrated using numerical simulations. This approach can be accurate in the cases considered, but lacks generality and does not provide a physical understanding of the processes involved. Recently, we demonstrated that truncating NFW distribution functions sharply in energy results in density profiles that resemble those of tidally stripped systems, offering a path to constructing physically motivated models of tidal mass loss. In this work, we review calculations of mass loss based on energy truncation alone, and then consider what secondary effects may modulate mass loss beyond this. We find that a combination of dependence on additional orbital parameters and variations in individual particle energies over an orbit results in a less abrupt truncation in energy space as a subhalo loses mass. Combining the energy truncation approach with a simple prediction for the mass-loss rate, we construct a full model of mass loss that can accurately predict the evolution of a subhalo in terms of a single parameter $η_{\rm eff}$. This parameter can be fully determined from the initial orbital and halo properties, and does not require calibration with numerical simulations.

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