Collaborative Research: The GOGREEN Survey - Caring about the Environment

合作研究：GOGREEN 调查 - 关心环境

• 批准号: 1518257
• 负责人: Michael Cooper
• 金额: $ 35.53万
• 依托单位: University of California-Irvine
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-09-01 至 2020-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1518257&HistoricalAwards=false
• 关键词: Collaborative; Research; GOGREEN; Survey; Caring

The team will use ground-based telescopes to study the vast population of "satellite" galaxies that live in the suburbs of cities of galaxies called clusters. We know that satellite galaxies can transform themselves from bluish systems rife with brilliant, young stars into reddish systems filled with dull, old stars. But models that attempt explain this remarkable transformation fail dismally. This means that the modellers need much more guidance about factors that govern a galaxy's life in the suburbs. The team will provide that important guidance. The team will also expand existing, successful outreach programs at their institutions. Areas of emphasis include high school students using the new data to conduct inquiry-based research, school teachers adding evidence-based research into their lesson plans, deaf students "smelling" and "touching" data that have been suitably transformed, and Hispanic students being encouraged to continue on from college to graduate school.The aim of the project is to examine the physical processes responsible for quenching the star formation in clusters' satellite galaxies, as distinct from their central galaxies. Models of central-galaxy quenching agree well with observations. In contrast, models of satellite-galaxy quenching strongly violate observations, meaning that such models need better guidance about the processes involved. The team will provide that guidance by obtaining new spectroscopic data for massive groups and clusters at redshifts of 1-1.5 and comparing those data to existing lower-redshift data. These comparisons will be used to analyze the dominant modes of satellite quenching, how galaxies populate dark-matter halos as a function of environment, the relative timing of morphological transformation and star-formation quenching, and the dominant driver of size growth in quenched galaxies. These results will lead to new, better-informed models of satellite-galaxy quenching.

该团队将使用地面望远镜来研究居住在星系团城市郊区的大量“卫星”星系。我们知道，卫星星系可以从充满明亮年轻恒星的蓝色系统转变为充满暗淡老年恒星的红色系统。但试图解释这一显着转变的模型却惨遭失败。这意味着建模者需要更多关于控制郊区星系生命的因素的指导。该团队将提供重要的指导。该团队还将扩大其机构现有的、成功的外展项目。重点领域包括高中生使用新数据进行基于探究的研究，学校教师将基于证据的研究添加到他们的课程计划中，聋哑学生“闻”和“触摸”经过适当转换的数据，以及鼓励西班牙裔学生继续从大学到研究生院。该项目的目的是检查导致星团卫星星系（不同于其中心星系）恒星形成的物理过程。中央星系猝灭模型与观测结果非常吻合。相比之下，卫星星系猝灭模型严重违反了观测结果，这意味着此类模型需要对所涉及的过程提供更好的指导。该团队将通过获取红移为 1-1.5 的大规模群和星团的新光谱数据并将这些数据与现有的较低红移数据进行比较来提供指导。这些比较将用于分析卫星猝灭的主要模式、星系如何根据环境填充暗物质晕、形态转变和恒星形成猝灭的相对时间，以及猝灭星系尺寸增长的主要驱动因素。这些结果将带来新的、信息更丰富的卫星星系猝灭模型。