CAREER: Following the Flow of Gas Through Dwarf Satellites

职业：追踪穿过矮卫星的气体流动

• 批准号: 1848107
• 负责人: Charlotte Christensen
• 金额: $ 48.43万
• 依托单位: Grinnell College
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-06-01 至 2025-05-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1848107&HistoricalAwards=false
• 关键词: CAREER; Following; Flow; Gas; Through

The investigator seeks to understand how galaxies form with such amazing varieties of structure and content. Astronomers have found that galaxies grow through a balance of gas loss, gas in-fall, and star formation. However, what drives these processes is only poorly understood. She will model dwarf galaxies, which are ideal test subjects for studying galaxy growth. The dwarf galaxies have low masses, making them especially sensitive to the energy input from newly forming stars. The investigator plans a comprehensive comparison of the observations to their numerical models.When studying the growth of dwarf galaxies, astronomers must first account for the environment in which they exist. Dwarf galaxies are generally found close to more massive galaxies, which can both prevent gas accretion onto dwarf galaxies and aid gas loss from them. Therefore, the investigator will examine the effects of both environment and internal processes on the growth of dwarf galaxies. Using extremely high-resolution, realistic computer simulations, she will map the flow of gas to identify what spurs and halts dwarf galaxy growth. To further study the effect of environment, she will compare the properties of dwarf galaxies at different distances from more massive galaxies. Finally, she will examine the gas transferred from dwarf galaxies to their massive neighbors, to better understand the connection between galaxies.In parallel with this research, the investigator will develop computational exercises, such as labs and open-ended research projects, for undergraduate physics students. These lessons will develop students' programming abilities while reinforcing skills like problem solving and persistence. This project also supports continued efforts to increase inclusivity within the Grinnell College science division. Additionally, it will support summer research opportunities for twelve undergraduate students, including opportunities to present at national conferences and to visit collaborators at research institutions.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.

这位研究人员试图了解星系是如何形成具有如此惊人的结构和内容的。天文学家发现，星系的生长经历了气体损失、气体坠落和恒星形成的平衡。然而，人们对这些过程的驱动力还知之甚少。她将模拟矮星系，这是研究星系增长的理想测试对象。矮小星系的质量很低，这使得它们对新形成的恒星的能量输入特别敏感。这位研究人员计划将观测结果与他们的数值模型进行全面的比较。在研究矮小星系的增长时，天文学家必须首先考虑它们所处的环境。矮小星系通常被发现靠近更大质量的星系，这既可以防止气体吸积到矮小星系上，也可以帮助它们损失气体。因此，研究人员将研究环境和内部过程对矮小星系生长的影响。使用极高分辨率、逼真的计算机模拟，她将绘制气体流动图，以确定是什么刺激和阻止了矮小星系的增长。为了进一步研究环境的影响，她将比较距离更大星系不同距离的矮星系的性质。最后，她将研究从矮小星系转移到其大质量邻居的气体，以更好地了解星系之间的联系。在这项研究的同时，研究人员将为本科生物理专业学生开发计算练习，如实验室和开放式研究项目。这些课程将培养学生的编程能力，同时加强解决问题和坚持不懈的技能。该项目还支持继续努力提高格林内尔学院科学部的包容性。此外，它还将支持12名本科生的暑期研究机会，包括出席国家会议和访问研究机构的合作者的机会。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势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

Quenching Timescales of Dwarf Satellites around Milky Way–mass Hosts

银河系周围矮卫星的淬灭时间尺度——质量宿主

• DOI: 10.3847/1538-4357/abe2ab
• 发表时间: 2021
• 期刊: The Astrophysical Journal
• 作者: Akins, Hollis B.;Christensen, Charlotte R.;Brooks, Alyson M.;Munshi, Ferah;Applebaum, Elaad;Engelhardt, Anna;Chamberland, Lucas
• 通讯作者: Chamberland, Lucas