Collaborative Research: Magellanic dwarfs as a key laboratory for dwarf galaxy formation

合作研究：麦哲伦矮星作为矮星系形成的重点实验室

• 批准号: 2107993
• 负责人: Laura Sales
• 金额: $ 30.2万
• 依托单位: University of California-Riverside
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-09-01 至 2024-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2107993&HistoricalAwards=false
• 关键词: Collaborative; Research; Magellanic; dwarfs; key

The standard cosmological Dark Matter (DM) scenario predicts that all galaxies are surrounded by DM in a variety of shapes. The investigators seek to understand star formation processes in dwarf galaxies, which is influenced by the shape of DM structures around these ultra-faint galaxies. The Large Magellanic Cloud (LMC) is the most important dwarf galaxy that orbits our Milky Way, and many of the discoveries of new ultra-faint galaxies over the last few years have been near the LMC. The investigators will numerically model the formation of dwarf galaxies, and they will compare their model predictions to. This research will involve students at both institutions, who will assist in the research and learn computer programming skills. The investigators will generate and analyze new ultra-high-resolution cosmological zoom-in hydrodynamical simulations from the FIRE project to study the formation and evolution of 5 LMC-like halos, to sample different assembly histories and cosmological scatter. By understanding the satellite population of the LMC and LMC-like galaxies, the investigators will constrain the physics of galaxy formation at the smallest scales. The team will run several variations in reionization time, early-universe star formation, and increased resolution, to study their impact on the predicted population of ultra-faint satellites today. This effort will extend the suite of high-resolution zoom-in simulations into the lowest-mass regime of galaxy formation. The investigators address 3 fundamental questions: (1) the counts and masses of ultra-faint satellite galaxies around LMC-like galaxies; (2) the star-formation histories of ultra-faint dwarf galaxies and the impact of internal (e.g. stellar feedback) versus external (e.g. reionization, environmental effects) processes; and (3) the expected stellar halo component around LMC-mass galaxies. They will involve undergraduates from underrepresented groups in their research.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

标准宇宙学暗物质 (DM) 场景预测所有星系都被各种形状的暗物质包围。 研究人员试图了解矮星系中的恒星形成过程，该过程受到这些超微弱星系周围的 DM 结构形状的影响。大麦哲伦星云 (LMC) 是绕银河系运行的最重要的矮星系，过去几年发现的许多新的超微弱星系都位于 LMC 附近。研究人员将对矮星系的形成进行数值模拟，并将模型预测与矮星系的预测进行比较。这项研究将涉及两个机构的学生，他们将协助研究并学习计算机编程技能。研究人员将生成并分析来自 FIRE 项目的新的超高分辨率宇宙学放大流体动力学模拟，以研究 5 个类似 LMC 光环的形成和演化，对不同的组装历史和宇宙学散射进行采样。通过了解大麦哲伦星系和类大麦哲伦星系的卫星群，研究人员将在最小尺度上限制星系形成的物理学。 该团队将在再电离时间、早期宇宙恒星形成和分辨率提高方面进行多种变化，以研究它们对当今预测的超微弱卫星数量的影响。这项工作将把高分辨率放大模拟套件扩展到星系形成的最低质量状态。研究人员解决了 3 个基本问题：（1）类 LMC 星系周围超微弱卫星星系的数量和质量； (2) 超微弱矮星系的恒星形成历史以及内部（例如恒星反馈）与外部（例如再电离、环境影响）过程的影响； (3) LMC 质量星系周围预期的恒星晕成分。他们将让来自代表性不足群体的本科生参与他们的研究。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

Baryonic solutions and challenges for cosmological models of dwarf galaxies

• DOI: 10.1038/s41550-022-01689-w
• 发表时间: 2022-06
• 期刊: Nature Astronomy
• 影响因子: 14.1
• 作者: L. Sales;A. Wetzel;Azadeh Fattahi

Satellite mass functions and the faint end of the galaxy mass–halo mass relation in LCDM

卫星质量函数和 LCDM 中星系质量和晕质量关系的微弱末端

• DOI: 10.1093/mnras/stac2057
• 发表时间: 2022
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Santos-Santos, Isabel M. E.;Sales, Laura V.;Fattahi, Azadeh;Navarro, Julio F.
• 通讯作者: Navarro, Julio F.