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: 2107772
• 负责人: Andrew Wetzel
• 金额: $ 27.32万
• 依托单位: University of California-Davis
• 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=2107772&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.

标准的宇宙暗物质（DM）场景预测，所有星系均被多种形状的DM包围。 研究人员试图了解矮星系中的恒星形成过程，该过程受这些超生殖星系周围DM结构的形状的影响。大型麦哲伦云（LMC）是绕我们的银河系绕的最重要的矮星银河，过去几年中，新的超生物星系的许多发现都在LMC附近。研究人员将在数值上对矮星系的形成进行建模，并将其模型预测与其进行比较。这项研究将涉及两家机构的学生，他们将协助研究并学习计算机编程技能。研究人员将生成和分析来自火灾项目的新的超高分辨率宇宙学的流体动力学模拟，以研究5个类似LMC的光环的形成和演化，以样品采样不同的组装历史和宇宙学散布。通过了解LMC和类似LMC的星系的卫星种群，研究人员将在最小的尺度上限制星系形成的物理。 该团队将在电离时间，早期的星星形成和增加的分辨率方面进行几种变化，以研究其对当今超生产卫星的预测人群的影响。这项工作将将高分辨率缩放模拟的套件扩展到星系形成的最低质量状态。调查人员解决了3个基本问题：（1）在类似LMC的星系周围的超品种卫星星系的数量和群体； （2）超生物矮星系的星形成历史以及内部（例如恒星反馈）与外部（例如电离，环境效应）过程的影响； （3）LMC质量星系周围的预期恒星光环分量。他们将在其研究中涉及来自代表性不足的群体的大学生。该奖项反映了NSF的法定任务，并使用基金会的知识分子优点和更广泛的影响审查标准，被视为值得通过评估来获得支持。

项目成果

Extinguishing the FIRE: environmental quenching of satellite galaxies around Milky Way-mass hosts in simulations

灭火：模拟中银河系质量宿主周围卫星星系的环境淬灭

• DOI: 10.1093/mnras/stac1706
• 发表时间: 2022
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Samuel, Jenna;Wetzel, Andrew;Santistevan, Isaiah;Tollerud, Erik;Moreno, Jorge;Boylan-Kolchin, Michael;Bailin, Jeremy;Pardasani, Bhavya
• 通讯作者: Pardasani, Bhavya

Spatially resolved gas-phase metallicity in FIRE-2 dwarfs: late-time evolution of metallicity relations in simulations with feedback and mergers

FIRE-2矮星中空间分辨的气相金属丰度：反馈和合并模拟中金属丰度关系的后期演化

• DOI: 10.1093/mnras/stac1958
• 发表时间: 2022
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Porter, Lori E.;Orr, Matthew E.;Burkhart, Blakesley;Wetzel, Andrew;Ma, Xiangcheng;Hopkins, Philip F.;Emerick, Andrew
• 通讯作者: Emerick, Andrew

Galaxies lacking dark matter produced by close encounters in a cosmological simulation

• DOI: 10.1038/s41550-021-01598-4
• 发表时间: 2022-02-14
• 期刊: NATURE ASTRONOMY
• 影响因子: 14.1
• 作者: Moreno, Jorge;Danieli, Shany;Keres, Dusan
• 通讯作者: Keres, Dusan

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

Progenitor-mass-dependent yields amplify intrinsic scatter in dwarf-galaxy elemental abundance ratios

• DOI: 10.1093/mnras/stab2572
• 发表时间: 2020-08
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Dhruv Muley;Coral Wheeler;P. Hopkins;A. Wetzel;A. Emerick;D. Keres̆