Collaborative Research: The GOGREEN Survey - Caring about the Environment

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年老恒星的红色系统。但试图解释这种显著转变的模型却令人沮丧地失败了。这意味着建模者需要更多关于控制星系郊区生命的因素的指导。团队将提供重要的指导。该团队还将扩大其所在机构现有的成功外展项目。重点领域包括高中生使用新数据进行基于探究的研究，学校教师在他们的课程计划中加入基于证据的研究，聋哑学生“嗅”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。该项目的目的是研究在星团的卫星星系（与它们的中心星系不同）中负责熄灭恒星形成的物理过程。中央星系猝灭的模型与观测结果非常吻合。相比之下，卫星星系猝灭的模型严重违背观测结果，这意味着这些模型需要更好地指导所涉及的过程。该团队将通过获得红移1-1.5的大质量星团和星团的新光谱数据，并将这些数据与现有的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，星系如何作为环境的函数填充暗物质晕，形态转变和恒星形成猝灭的相对时间，以及猝灭星系中尺寸增长的主要驱动因素。这些结果将产生新的、信息更灵通的卫星星系猝灭模型。

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.