Following the Turbulent Enrichment of the High-Redshift Universe

跟随高红移宇宙的湍流浓缩

• 批准号: 1715876
• 负责人: Evan Scannapieco
• 金额: $ 50.32万
• 依托单位: Arizona State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-08-15 至 2022-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1715876&HistoricalAwards=false
• 关键词: Following; Turbulent; Enrichment; Redshift; Universe

All stars observed today are enriched with heavy elements (heavier than hydrogen or helium) made by previous stellar generations. This project will track the process of element enrichment using new and extremely accurate numerical techniques developed by the research team and shed new light on the stellar generation that first created carbon, nitrogen, oxygen, and many of the other elements necessary for life. The research will be driven by graduate students, providing them with rigorous training in astronomy and computational physics. Furthermore, the results will be disseminated broadly through the presentation of public lectures, helping to engage a larger community in the excitement of astronomy and the ongoing search for the missing first generation of stars.To study the evolution of the first generation of heavy-element free (Population III, Pop III) stars, the research team has developed a unique, carefully tested subgrid mixing model that tracks three quantities: (i) the heavy elements generated by Pop III stars, (ii) the heavy elements generated by subsequent stellar populations, and (iii) the fraction of unpolluted gas. The project would build upon this capability to develop cosmological simulations that simultaneously model mixing, chemistry, and radiative transfer and to carry out a suite of such simulations that spans the unknown properties of Pop III stars. Working with observational experts, the team will apply these results to provide insights into how unknown Pop III properties can be constrained using metal-poor stars observed in the Milky Way and metal-poor galaxies observed at high-redshift. These predictions will not only help interpret current data but will also drive mission planning for the next generation of ground- and space-based telescopes.

今天观测到的所有恒星都富含前几代恒星产生的重元素（比氢或氦重）。 该项目将使用研究团队开发的新的和非常精确的数值技术来跟踪元素富集的过程，并为首次创造碳，氮，氧和许多其他生命所必需的元素的恒星一代提供新的见解。 这项研究将由研究生推动，为他们提供天文学和计算物理学方面的严格培训。此外，研究结果将通过公开讲座的形式广泛传播，帮助更大的社区参与天文学的兴奋和正在进行的寻找失踪的第一代恒星的工作。（Population III，Pop III）明星，研究团队开发了一个独特的，经过仔细测试的亚网格混合模型，跟踪三个量：（i）Pop III恒星产生的重元素，（ii）后续恒星群产生的重元素，以及（iii）未污染气体的分数。 该项目将建立在这种能力的基础上，开发宇宙学模拟，同时模拟混合，化学和辐射传输，并进行一套此类模拟，涵盖Pop III恒星的未知特性。 与观测专家合作，该团队将应用这些结果来深入了解如何使用在银河系中观察到的贫金属恒星和在高红移处观察到的贫金属星系来限制未知的Pop III属性。 这些预测不仅有助于解释当前的数据，还将推动下一代地面和空间望远镜的使命规划。

项目成果

Magnetic Helicity Dissipation and Production in an Ideal MHD Code

• DOI: 10.3847/1538-4357/ab5e7f
• 发表时间: 2019-10
• 期刊: The Astrophysical Journal
• 作者: A. Brandenburg;E. Scannapieco

The Launching of Cold Clouds by Galaxy Outflows. III. The Influence of Magnetic Fields

星系外流发射冷云。

• DOI: 10.3847/1538-4357/ab76d1
• 发表时间: 2020
• 期刊: The Astrophysical Journal
• 作者: Cottle, J’Neil;Scannapieco, Evan;Brüggen, Marcus;Banda-Barragán, Wladimir;Federrath, Christoph
• 通讯作者: Federrath, Christoph

On Neutron Star Mergers as the Source of r -process-enhanced Metal-poor Stars in the Milky Way

论中子星合并作为银河系中r过程增强贫金属恒星的来源

• DOI: 10.3847/1538-4357/ab1341
• 发表时间: 2019
• 期刊: The Astrophysical Journal
• 作者: Safarzadeh, Mohammadtaher;Sarmento, Richard;Scannapieco, Evan
• 通讯作者: Scannapieco, Evan

Catastrophic Cooling in Superwinds: Line Emission and Non-equilibrium Ionization

超级风中的灾难性冷却：线发射和非平衡电离

• DOI: 10.3847/1538-4357/ab510d
• 发表时间: 2019
• 期刊: The Astrophysical Journal
• 作者: Gray, William J.;Oey, M. S.;Silich, Sergiy;Scannapieco, Evan
• 通讯作者: Scannapieco, Evan

The Thermal Sunyaev–Zel’dovich Effect from Massive, Quiescent 0.5 ≤ z ≤ 1.5 Galaxies

巨大静止 0.5 ~ z ~ 1.5 星系的热苏尼亚耶夫·泽尔·多维奇效应

• DOI: 10.3847/1538-4357/abf2b4
• 发表时间: 2021
• 期刊: The Astrophysical Journal
• 作者: Meinke, Jeremy;Böckmann, Kathrin;Cohen, Seth;Mauskopf, Philip;Scannapieco, Evan;Sarmento, Richard;Lunde, Emily;Cottle, J’Neil
• 通讯作者: Cottle, J’Neil