Simulating the interstellar medium and stellar feedback on a moving mesh: implementation and isolated galaxies
Simulating the interstellar medium and stellar feedback on a moving mesh: implementation and isolated galaxies
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DOI：
10.1093/mnras/stz2391
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发表时间：
2019-05
影响因子：
4.8
通讯作者：
F. Marinacci;L. Sales;M. Vogelsberger;P. Torrey;V. Springel
中科院分区：
文献类型：
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作者：
F. Marinacci;L. Sales;M. Vogelsberger;P. Torrey;V. Springel
本文介绍了星系中的恒星和多相气体模型——SMUGGLE模型，这是一种用于移动网格代码arepo的显式综合恒星反馈模型。这种新型的亚分辨率模型可以解析星际介质的多相气体结构，并自洽地产生气体流出。该模型实现了恒星反馈的关键方面，包括光电离、辐射压力、能量和来自恒星风和超新星的动量注入。我们在银河系类盘状星系的高分辨率孤立模拟中探索了这个模型。恒星反馈将恒星的形成调节到可观测的水平，并自然地捕捉到kennicut - schmidt关系的建立。该结果与模拟的数值质量和空间分辨率无关。气体流出产生的平均质量负荷因子为1数量级。强烈的流出活动与星系恒星形成历史的高峰有关，有证据表明，大多数喷出的气体最终以星系喷泉流的形式落在圆盘上，维持了后期恒星的形成。最后，星系内的星际气体呈现出明显的多相分布，冷、暖、热相并存。
We introduce the Stars and MUltiphase Gas in GaLaxiEs – SMUGGLE model, an explicit and comprehensive stellar feedback model for the moving-mesh code arepo. This novel sub-resolution model resolves the multiphase gas structure of the interstellar medium and self-consistently generates gaseous outflows. The model implements crucial aspects of stellar feedback including photoionization, radiation pressure, energy, and momentum injection from stellar winds and from supernovae. We explore this model in high-resolution isolated simulations of Milky Way like disc galaxies. Stellar feedback regulates star formation to the observed level and naturally captures the establishment of a Kennicutt–Schmidt relation. This result is achieved independent of the numerical mass and spatial resolution of the simulations. Gaseous outflows are generated with average mass loading factors of the order of unity. Strong outflow activity is correlated with peaks in the star formation history of the galaxy with evidence that most of the ejected gas eventually rains down on to the disc in a galactic fountain flow that sustains late-time star formation. Finally, the interstellar gas in the galaxy shows a distinct multiphase distribution with a coexistence of cold, warm, and hot phases.