Public Release of A-SLOTH: Ancient Stars and Local Observables by Tracing Halos
Public Release of A-SLOTH: Ancient Stars and Local Observables by Tracing Halos
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DOI：
10.3847/1538-4357/ac7150
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发表时间：
2022-06
期刊：
影响因子：
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通讯作者：
T. Hartwig;M. Magg;Li-Hsin Chen;Y. Tarumi;V. Bromm;S. Glover;A. Ji;R. Klessen;M. Latif
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文献类型：
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作者：
T. Hartwig;M. Magg;Li-Hsin Chen;Y. Tarumi;V. Bromm;S. Glover;A. Ji;R. Klessen;M. Latif
半解析模型a-sloth（Ancient Stars and Local Observables by Tracing Halos）是第一个将第一个恒星和星系的形成与观测数据联系起来的公共代码。在几个成功的项目之后，我们发布了源代码（https：//gitlab.com/thartwig/asloth），并在本文中描述了公共版本。该模型是基于暗物质合并树，可以生成基于扩展的Press-Schechter理论或从暗物质模拟导入。在这些合并树的顶部，a-sloth应用重子物理学的分析方法，以前所未有的精确度和保真度模拟了无金属和贫金属恒星的形成以及它们之间的过渡。a-sloth对单个恒星进行采样，包括辐射、化学和机械反馈。它是基于六个观测值，如汤姆逊散射的光学深度，银河系及其卫星星系的恒星质量，极端贫金属恒星的数量，以及宇宙星星形成率密度在高红移校准。a-sloth具有中等计算要求的多用途应用。它可以用来根据局部观测值来约束第一恒星和高z星系的性质，预测银河系中最古老和最贫金属恒星的性质，可以作为更大宇宙学模拟的亚网格模型，并预测早期宇宙的下一代观测值，如超新星速率或引力波事件。
The semianalytical model a-sloth (Ancient Stars and Local Observables by Tracing Halos) is the first public code that connects the formation of the first stars and galaxies to observables. After several successful projects with this model, we publish the source code (https://gitlab.com/thartwig/asloth) and describe the public version in this paper. The model is based on dark matter merger trees that can either be generated based on Extended Press–Schechter theory or be imported from dark matter simulations. On top of these merger trees, a-sloth applies analytical recipes for baryonic physics to model the formation of both metal-free and metal-poor stars and the transition between them with unprecedented precision and fidelity. a-sloth samples individual stars and includes radiative, chemical, and mechanical feedback. It is calibrated based on six observables, such as the optical depth to Thomson scattering, the stellar mass of the Milky Way and its satellite galaxies, the number of extremely metal-poor stars, and the cosmic star formation rate density at high redshift. a-sloth has versatile applications with moderate computational requirements. It can be used to constrain the properties of the first stars and high-z galaxies based on local observables, predicts properties of the oldest and most metal-poor stars in the Milky Way, can serve as a subgrid model for larger cosmological simulations, and predicts next-generation observables of the early universe, such as supernova rates or gravitational wave events.