Galaxy Evolution and Environment

星系演化与环境

• 批准号: RGPIN-2016-06586
• 负责人: Yee, Howard
• 金额: $ 2.91万
• 依托单位: University of Toronto
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=687737
• 关键词: Galaxy; Evolution; Environment

The formation and evolution of galaxies is intimately tied to the environment and large scale structure in which they reside. Galaxy groups and clusters provide a unique laboratory to study the effects of a range of environments, up to that of the densest in the universe, on galaxy evolution and the history of star formation. The study of cluster evolution, including the galaxy population, cluster morphology, mergers, cluster mass function and the build-up of the giant central galaxy (called Brightest Cluster Galaxy, or BGC) informs many issues directly related to both galaxy formation and evolution, the growth of large-scale structure, and cosmology. ***My proposal will be based on three large surveys of clusters designed to optimize the study of clusters at redshift (z) greater than 1 (or, when the universe was less than half of its current age). The two surveys already completed their data acquisition and reduction are: the SpARCS (Spitzer Adaptation of the Red-Sequence Cluster Survey) survey, which uses infrared imaging from the Spitzer Space Telescope combined with optical imaging from ground-based telescopes to produce a catalog of over 200 clusters at z>1; and GCLASS (Gemini Cluster Astrophysical Science Survey), which obtained spectra for over 400 cluster galaxies in 9 of the riches clusters from SpARCS at z~1. The third is the on-going GoGreen Project (Gemini Observations of Galaxies in Early Rich Environments), an approved large program at the Gemini Observatory, which will obtain spectra for ~1000 cluster members in 21 galaxy clusters and groups at z>1.***One key scientific goal of my proposal is to use these large spectroscopic and photometric catalogs to explore the time scale of the suppression of star formation in galaxies in-falling into groups and clusters. This will be done by examining various star-formation indicators for galaxies in different locations of the clusters. Another main project is to investigate the frequency and types of merging galaxies in clusters and different galaxy density regions, allowing us to gain insights into the contribution of mergers to both inducing and the quenching of star formation.***I will also use the very extensive cluster and galaxy catalogs to investigate the shape of galaxy clusters as a function of epoch and probe the connections between the morphology of galaxy clusters to cluster evolution and the cluster galaxy population, comparing these results with simulations. The goal is to investigate how cluster morphology correlates with the mass build-up of clusters and stellar contents of clusters.

星系的形成和演化与其所处的环境和大尺度结构密切相关。星系群和星系团提供了一个独特的实验室来研究一系列环境对星系演化和恒星形成历史的影响，包括宇宙中密度最高的环境。星系团演化的研究，包括星系群、星团形态、合并、星团质量函数和巨型中心星系(称为最亮星团星系，简称BGC)的形成，提供了许多与星系形成和演化、大尺度结构增长和宇宙学直接相关的问题。*我的建议将基于三个大型星系团调查，旨在优化红移(Z)大于1(或宇宙年龄不到当前年龄的一半)的星系团研究。已经完成数据采集和缩减的两项调查是：SPARCS(红色序列星系团调查的斯皮策适配)调查，它使用斯皮策空间望远镜的红外成像和地面望远镜的光学成像相结合的方式，在z&gt；1产生一个包含200多个星系团的星表；和GCLASS(双子座星团天体物理科学调查)，它从位于z~1的SPARCS获得了9个丰富星系团的400多个星系团的光谱。第三个是正在进行的GoGreen计划(对早期丰富环境中的星系的双子座观测)，这是双子座天文台批准的一个大型计划，将在z&gt；1获得21个星系团和星团的约1000名星系团成员的光谱。*我提议的一个关键科学目标是使用这些大型光谱和光度星表来探索星系落入群组和星系团中恒星形成受到抑制的时间尺度。这将通过检查星系团不同位置的星系的各种恒星形成指标来完成。另一个主要项目是调查星系团和不同星系密度区域中合并星系的频率和类型，使我们能够深入了解合并对恒星形成的诱导和猝灭的贡献。*我还将使用非常广泛的星系团和星系表来研究星系团的形状随时代的变化，并探索星系团的形态与星系团演化和星系团星系数量之间的关系，将这些结果与模拟结果进行比较。目标是研究星团形态如何与星团的质量积聚和星团的恒星含量相关。