Collaborative Research: The GOGREEN Survey - Caring about the Environment

该团队将使用地面望远镜来研究大量的“卫星”星系，这些星系生活在被称为星系团的星系城市郊区。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。但试图解释这一显著转变的模型却以失败告终。这就意味着，模型制作者需要更多的指导，以了解控制郊区星系生命的因素。该小组将提供这一重要指导。该小组还将扩大其机构现有的成功的外联方案。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，聋人学生“闻到”和“触摸”经过适当转换的数据，该项目的目的是研究导致星星形成的物理过程，星系团的卫星星系，与它们的中心星系不同。中心星系淬灭的模型与观测结果吻合得很好。相比之下，卫星星系淬火的模型严重违反了观测结果，这意味着这些模型需要更好的指导所涉及的过程。该团队将通过获得红移为1-1.5的大质量星系团和星系团的新光谱数据，并将这些数据与现有的低红移数据进行比较来提供指导。这些比较将被用来分析卫星淬火的主导模式，星系如何填充暗物质晕作为环境的函数，形态转变和恒星形成淬火的相对时间，以及淬火星系尺寸增长的主要驱动因素。这些结果将导致新的，更好的卫星星系淬火模型。

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.