在星系形成模拟中加入星系风的新模型I：介绍物理演化风（PhEW）模型
A New Model For Including Galactic Winds in Simulations of Galaxy Formation I: Introducing the Physically Evolved Winds (PhEW) Model
摘要：
冷星系风在星系晕中的传播和演化是星系形成模型的关键。然而，由于缺乏数值分辨率，在星系形成的流体动力学模拟中对这一过程的建模过于简化，并且常常忽略关键的物理过程，如流体动力学不稳定性和热传导。我们提出了一个分析模型，物理演变的风（PhEW），计算个别云的演变超音速移动通过一个统一的环境介质。我们的模型再现了非常高分辨率的云破碎模拟，包括在广泛的物理条件下的各向同性热传导的预测。我们讨论了这个模型的实施到宇宙学流体动力学模拟的星系形成作为一个子网格处方模型星系风更强大的物理和数值。
英文摘要：
The propagation and evolution of cold galactic winds in galactic haloes is crucial to galaxy formation models. However, modelling of this process in hydrodynamic simulations of galaxy formation is over-simplified owing to a lack of numerical resolution and often neglects critical physical processes such as hydrodynamic instabilities and thermal conduction. We propose an analytic model, Physically Evolved Winds (PhEW), that calculates the evolution of individual clouds moving supersonically through a uniform ambient medium. Our model reproduces predictions from very high resolution cloud-crushing simulations that include isotropic thermal conduction over a wide range of physical conditions. We discuss the implementation of this model into cosmological hydrodynamic simulations of galaxy formation as a sub-grid prescription to model galactic winds more robustly both physically and numerically.
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