Collaborative Project: Large Scale Structure at High Redshift.

合作项目：高红移大型结构。

• 批准号: 9116390
• 负责人: Arlin P. Crotts
• 金额: $ 11.93万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-05-15 至 1994-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9116390&HistoricalAwards=false
• 关键词: Collaborative; Project; Large; Scale; Structure

How did the universe, which apparently began with an almost perfectly uniformly expanding Big Bang, evolve into the present exceedingly complex and granular structure of galaxies, clusters and superclusters of galaxies, and vast voids? Theories to account for this are best tested by observations of the changing clustering of objects over exceedingly great distances and look back times toward the beginning. Only quasars are bright enough to permit this, but they are too few in number to define the early structure. Far more numerous absorbing objects exist between us and the distant quasars. Using an existing multifiber spectrograph (to be in the second year of the grant) and the McDonald Observatory 2.7 - meter reflector to detect and analyze the redshifts of these absorbing clouds along lines of sight to the quasars, the clustering of large numbers of otherwise undectable high redshift objects can be described, thereby directly studying the evolution of large-scale structure in the universe. The effects of ionizing flux from quasars upon their local neutral hydrogen environment will also be measured, and the incidence will be determined. This is the second part of a two part collaborative project. Dr. Smith has worked for many years in extragalactic studies. Dr. Crotts, the co-investigator, is a leading young instrumentalist.

宇宙显然是从一个几乎完全一致地膨胀的大爆炸开始的，它是如何演变成现在由星系、星系团和超星系团以及巨大的空洞组成的极其复杂和颗粒状的结构的？解释这一点的理论最好通过观察物体在非常远的距离上变化的集群来检验，并回顾开始时的时间。只有类星体足够明亮，才能做到这一点，但它们的数量太少，无法定义早期的结构。在我们和遥远的类星体之间存在着数量多得多的吸收物体。利用现有的多光纤光谱仪(将在拨款的第二年)和麦克唐纳天文台2.7米反射器来探测和分析这些吸收云沿视线到类星体的红移，可以描述大量原本无法检测的高红移天体的聚集，从而直接研究宇宙中大尺度结构的演化。还将测量类星体的电离通量对其局域中性氢环境的影响，并确定入射。这是一个由两部分组成的合作项目的第二部分。史密斯博士多年来一直从事河外研究。联合调查员克罗茨博士是一位杰出的年轻乐器演奏家。