星系合并与自适应网格细化：恒星形成和热气外流
Galaxy Mergers with Adaptive Mesh Refinement: Star Formation and Hot Gas Outflow
摘要：
在等级结构的形成中，星系的合并是频繁的，并且已知会显着影响它们的属性。为了理解这些相互作用，高分辨率的模拟是必不可少的，因为pc和Mpc尺度之间的非线性耦合。为此，我们提出了第一个自适应网格细化（AMR）模拟两个合并，低质量，最初富含气体的星系（1.8e10 Ms每个），包括恒星形成和反馈。通过~2e7总计算元素解决星系，我们实现了前所未有的多相星际介质的分辨率，发现一个广泛的星暴合并星系通过冲击诱导的恒星形成。AMR的高动态范围也使我们能够跟踪星系与其嵌入介质之间的相互作用，描绘星系外流和富含热金属的晕形成的方式。这些结果表明，AMR提供了一个强大的工具，在理解相互作用的星系。
英文摘要：
In hierarchical structure formation, merging of galaxies is frequent and known to dramatically affect their properties. To comprehend these interactions high-resolution simulations are indispensable because of the nonlinear coupling between pc and Mpc scales. To this end, we present the first adaptive mesh refinement (AMR) simulation of two merging, low mass, initially gas-rich galaxies (1.8e10 Ms each), including star formation and feedback. With galaxies resolved by ~2e7 total computational elements, we achieve unprecedented resolution of the multiphase interstellar medium, finding a widespread starburst in the merging galaxies via shock-induced star formation. The high dynamic range of AMR also allows us to follow the interplay between the galaxies and their embedding medium depicting how galactic outflows and a hot metal-rich halo form. These results demonstrate that AMR provides a powerful tool in understanding interacting galaxies.
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