The connection between galaxies and their host environments

星系与其宿主环境之间的联系

• 批准号: RGPIN-2015-06080
• 负责人: Parker, Laura
• 金额: $ 2.04万
• 依托单位: McMaster University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=661609
• 关键词: connection; between; galaxies; their; host

New telescope facilities and dedicated surveys have resulted in enormous progress in extra-galactic astronomy and cosmology over the past two decades. While we have now tightly constrained many of the fundamental cosmological parameters that describe our universe, there are still many unanswered questions concerning the formation and evolution of galaxies and larger structures. My research team is interested in studying the assembly of galaxies and the connection between observed galaxies and their environments. In order to address these topics we will study the evolution of galaxies in galaxy groups and clusters as a function of cosmic time.****Most galaxies in the local universe do not live in isolation, but are clustered into systems called galaxy groups. This environment, intermediate in density between rich galaxy clusters and isolated galaxies, appears to play an important role in galaxy evolution. However, relatively few sizable samples of groups have been identified at large distances. Over the past few years my team has been actively engaged in studying a large sample of groups at intermediate distances in order to understand the role that this environment plays in the evolution of galaxies. We have learned that the observed properties of group member galaxies depend on the group environment in which we find them, but that environmental effects are subtle and require large samples and careful analysis. In particular we have found that the properties of galaxies in groups depend on the assembly history of their host group, which can be traced using the motions of observed member galaxies. ****Over the next five years I plan to work with my students to study the evolution of more distant group galaxies from an epoch when the universe was much younger and many systems were just forming. Our goal is to shed light on the physical mechanisms governing the evolution of galaxies over cosmic time. We hope to further understand the diversity of galaxies and their properties and how their host environments affects this diversity. To answer these questions we will push the limits of current astronomical observations and plan for surveys with the next generation of facilities.**

在过去的二十年里，新的望远镜设备和专门的调查导致了银河系外天文学和宇宙学的巨大进步。虽然我们现在已经严格限制了描述我们宇宙的许多基本宇宙学参数，但关于星系和更大结构的形成和演化，仍然有许多未解之谜。我的研究小组对研究星系的集合以及观测到的星系和它们的环境之间的联系很感兴趣。为了解决这些问题，我们将研究星系群和星系团中星系的演化作为宇宙时间的函数。****本地宇宙中的大多数星系并不是孤立存在的，而是聚集在称为星系群的系统中。这种密度介于丰富星系团和孤立星系之间的环境似乎在星系演化中起着重要作用。然而，在较远的距离上发现的群体样本相对较少。在过去的几年里，我的团队一直在积极地研究大量中距离星系群的样本，以了解这种环境在星系演化中所起的作用。我们已经了解到，观测到的星系群成员星系的特性取决于我们发现它们所在的星系群环境，但环境的影响是微妙的，需要大量的样本和仔细的分析。特别是，我们发现星系群的性质依赖于它们主星系群的聚集历史，这可以用观测到的成员星系的运动来追踪。****在接下来的五年里，我计划和我的学生们一起研究更遥远的星系群的演化，那时宇宙要年轻得多，许多星系刚刚形成。我们的目标是阐明控制星系在宇宙时间内演化的物理机制。我们希望进一步了解星系的多样性及其特性，以及它们的宿主环境如何影响这种多样性。为了回答这些问题，我们将推动当前天文观测的极限，并计划使用下一代设施进行调查