The Role of Dwarf-Dwarf Galaxy Interactions Over Cosmic Time

矮星系与矮星系相互作用在宇宙时间中的作用

• 批准号: 1911107
• 负责人: Sabrina Stierwalt
• 金额: $ 22.31万
• 依托单位: Occidental 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: 2019-09-01 至 2024-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1911107&HistoricalAwards=false
• 关键词: Role; Dwarf; Galaxy; Interactions; Over

According to current understanding, large galaxies like our Milky Way are built through the merging together of smaller, dwarf galaxies, and yet research into these important merging events is still mostly uncharted territory. The numbers of known dwarfs in the nearby universe is about to sky-rocket with upcoming planned large surveys and the next generation thirty-meter class telescopes, but we lack answers to even basic questions surrounding their evolution. This project investigates the physical processes at work in a unique set of dwarfs caught in the act of merging. Since Los Angeles, the hub for this program, is known more for its traffic than for its clear skies, the investigators will develop a traveling planetarium program. This program will be run by undergraduates and it will bring science to those who normally would not have access to such an outreach program. Audiences will include low income, predominantly minority groups, while encouraging the students involved to become leaders in their academic and local communities.This project leverages the first systematic study of interacting dwarf galaxies, TiNy Titans, to investigate the impact of dwarf-dwarf interactions on galaxy evolution at all mass scales through a set of multiwavelength observations. Specifically, the project will produce the first comprehensive data sets of deep narrowband Halpha and broadband optical imaging, radio line and continuum maps of a large, systematically-selected sample of interacting dwarf galaxies and it will provide direct test of cosmological predictions. The main scientific goals of this project are aimed at quantifying the physical processes taking place in dwarf-dwarf interactions, including how star formation and gas processing behave in dwarf galaxies which are low metallicity, highly impacted by interactions, and may mirror conditions in the early universe. This project builds upon the extensive efforts by Occidental College to recruit underrepresented minority and first generation college-bound undergraduate students into science by providing these students with hands-on experience traveling to telescopes, conducting their own data reduction, and presenting their own results at national conferences.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.

根据目前的理解，像我们银河系这样的大星系是由较小的矮星系合并而成的，然而对这些重要合并事件的研究仍然是未知的领域。随着即将到来的大型调查计划和下一代30米级望远镜的使用，附近宇宙中已知的矮星数量将会激增，但我们甚至连有关它们演化的基本问题的答案都没有。这个项目研究了一组独特的矮星在合并过程中的物理过程。由于这个项目的中心洛杉矶以其交通而不是晴朗的天空而闻名，调查人员将开发一个旅行天文馆项目。这个项目将由本科生管理，它将把科学带给那些通常没有机会接触到这种外展项目的人。观众将包括低收入，主要是少数群体，同时鼓励参与的学生成为他们的学术和当地社区的领导者。该项目利用对相互作用的矮星系“小泰坦”的第一个系统研究，通过一组多波长观测，研究矮-矮相互作用对所有质量尺度下星系演化的影响。具体来说，该项目将产生第一个全面的深窄带Halpha和宽带光学成像的数据集，无线电线和连续图的一个大的，系统地选择相互作用的矮星系样本，它将提供宇宙学预测的直接测试。该项目的主要科学目标是量化在矮-矮相互作用中发生的物理过程，包括在金属丰度低、受相互作用影响大、可能反映早期宇宙条件的矮星系中恒星形成和气体处理的行为。这个项目建立在西方学院的广泛努力的基础上，通过为这些学生提供亲身体验望远镜的经验，进行他们自己的数据简化，并在国家会议上展示他们自己的结果，以招募代表性不足的少数民族和第一代大学生进入科学领域。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。