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的郊区。我们知道，卫星星系可以从布满明亮的年轻恒星的蓝色系统转变为布满暗淡的老恒星的微红色系统。但试图解释这一显着转变的模型惨败。这意味着，建模者需要更多关于支配郊区银河系生活的因素的指导。该团队将提供这一重要指导。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探究性研究，学校教师将循证研究添加到他们的教学计划中，聋人学生的“嗅觉”和“触摸”数据已被适当转换，西班牙裔学生被鼓励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中恒星形成的物理过程，这与它们的中心星系不同。中央星系猝灭的模型与观测结果吻合得很好。相比之下，卫星星系猝灭的模型强烈违反观测结果，这意味着这种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为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较低红移数据进行比较，来提供这一指导。这些比较将被用来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，以及猝灭星系中大小增长的主要驱动因素。这些结果将导致卫星星系猝灭的新的、更了解情况的模型。

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.