Understanding the Mechanisms Behind the Distribution of Galactic Metals

Chuhan Zhang,Zefeng Li,Zipeng Hu,Mark R. Krumholz

arXiv · Astrophysics of Galaxies（2024）

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Abstract

The evolution and distribution of metals within galaxies are critical for understanding galactic evolution and star formation processes, but the mechanisms responsible for shaping this distribution remain uncertain. In this study we carry out high-resolution simulations of an isolated Milky Way-like galaxy, including a star-by-star treatment of both feedback and element injection. We include seven key isotopes of observational and physical interest, and which are distributed across different nucleosynthetic channels. After running the simulations to statistical steady state, we examine the spatial and temporal statistics of the metal distributions and their fluctuations. We show that these statistics reflect a mixture properties dependent on the large-scale structure of the galaxy and those that vary depending on the particular nucleosynthetic channel that dominates production of a particular isotope. The former ensure that different elements are highly-correlated with one another even if they have different nucleosynthetic origins, and their spatial correlations vary together in time. The latter means that the small variations between elements that are present naturally break them into nucleosynthetic familiars, with elements that originate from different channels correlating better with each other than with elements with different origins. Our findings suggest both challenges and opportunities for ongoing efforts to use chemical measurements of gas and stars to unravel the history and physics of galaxy assembly.

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【要点】：本文通过高分辨率模拟研究银河系中金属元素的分布机制，揭示了金属分布的时空统计特性与银河系大尺度结构及不同核合成通道的关系。

【方法】：使用包含恒星个体反馈和元素注入处理的孤立银河系模拟，研究七种关键同位素的分布。

【实验】：通过模拟达到统计稳态后，分析金属分布的时空统计特性及其波动，使用的数据集为模拟生成的 Milky Way-like 星系数据，结果显示金属元素的空间相关性随时间变化，且不同核合成通道产生的元素在相关性上有所区别。

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