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.**

在过去的二十年中，新的望远镜设施和专门的调查导致了半乳酸天文学和宇宙学的巨大进展。尽管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变，仍然存在许多未解决的问题。我的研究团队有兴趣研究星系组装以及观察到的星系及其环境之间的联系。为了解决这些主题，我们将研究星系组和簇中星系的演变，这是宇宙时间的函数。****本地宇宙中的大多数星系都不孤立地生活，而是将其聚集在称为星系组的系统中。这种环境在富的星系簇和孤立星系之间的密度中间，似乎在星系进化中起着重要作用。但是，很少有相对较少的小组样本在大远处发现。在过去的几年中，我的团队一直积极研究中间距离的大量小组，以了解该环境在星系发展中所扮演的角色。我们了解到，观察到的组成员星系的特性取决于我们找到它们的组环境，但是环境效应是微妙的，需要大量样本和仔细的分析。特别是我们发现，组中星系的性质取决于其宿主组的组装历史，可以使用观察到的成员星系的运动来追溯。 ****在接下来的五年中，我计划与学生合作研究宇宙年轻得多，许多系统刚刚形成时，从一个时代开始的距离群体星系的演变。我们的目标是阐明在宇宙时间内管理星系演变的物理机制。我们希望进一步了解星系的多样性及其特性，以及他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察的局限性，并计划下一代设施的调查。**