Luminosity-dependent studies of high-redshift galaxies

高红移星系的光度依赖性研究

• 批准号: 343008-2007
• 负责人: Sawicki, Marcin
• 金额: $ 2.17万
• 依托单位: Saint Mary's University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2007
• 资助国家: 加拿大
• 起止时间: 2007-01-01 至 2008-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=363800
• 关键词: Luminosity; dependent; studies; redshift; galaxies

Over the last few years advances in observational technology and technique have made it possible to reach back in time and observe directly galaxies at high redshift, z>2 - i.e., at a time when galaxies were young. However, primarily for reasons of observational economy, most of the detailed studies of distant galaxies have focused on relatively luminous objects.  We currently know very little about faint galaxies that in fact form the bulk of the population by sheer number and that indeed are responsible for forming most of the majority of stars and heavy chemical elements in the distant universe.  This program will address this deficiency in our knowledge.  Over the next several years I will lead a program that will aim to understand the nature of distant star-forming galaxies by comparing faint and luminous high-redshift objects against each other. We will use existing as well as new data (to be acquired with space and ground-based telescopes) to measure the masses, ages, and other properties of very faint galaxies in the early, distant universe.  Then, by comparing faint against luminous galaxies located at the same epoch, we will be able to understand what makes them different from each other. Understanding these differences will give us important new insights into how galaxies in the distant universe form and evolve.

在过去的几年中，观测技术和技巧的进步使得能够及时回溯并直接观测高红移（z>2）的星系——即星系年轻时的星系。然而，主要出于观测经济性的原因，大多数对遥远星系的详细研究都集中在相对发光的物体上。  我们目前对微弱星系知之甚少，这些星系实际上从数量上来说构成了星系群的大部分，并且确实是遥远宇宙中大多数恒星和重化学元素形成的原因。  该计划将解决我们知识中的这一缺陷。  在接下来的几年里，我将领导一个项目，旨在通过比较微弱和明亮的高红移天体来了解遥远的恒星形成星系的性质。我们将使用现有的以及新的数据（通过太空和地面望远镜获取）来测量早期遥远宇宙中非常微弱星系的质量、年龄和其他特性。  然后，通过比较位于同一时期的暗星系和发光星系，我们将能够了解它们之间的不同之处。了解这些差异将为我们提供关于遥远宇宙中的星系如何形成和演化的重要新见解。