Old Stellar Populations at High Redshifts

高红移的老恒星族群

• 批准号: 0307335
• 负责人: Alan Stockton
• 金额: --
• 依托单位: University of Hawaii
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-07-15 至 2009-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0307335&HistoricalAwards=false
• 关键词: Old; Stellar; Populations; Redshifts

AST-0307335StocktonSemi-analytic models based on the standard cold dark matter (CDM) theory suggest that most elliptical galaxies formed between redshifts one and two, with the most massive forming most recently. However, there are observations which sit uneasily with this picture. Although some questions can be addressed by careful and detailed examination of local ellipticals, it is nevertheless crucial to have observations of galaxies at high redshifts with populations of stars that were already old at the epoch corresponding to those redshifts (simply called 'old galaxies'). The centerpiece of this project is acquiring images of a significant and representative sample of old galaxies at redshifts between 1.5 and 2.5, and possibly also in the range 3:4 to 3:8, using adaptive optics (AO) on 8-m-class telescopes to deliver resolutions three to four times better than can be obtained with the Hubble Space Telescope. Emphasis is on infra-red imaging, starting with fields for which deep optical data already exist, to yield volume density, clustering properties, and the distribution of morphologies. Identifying and determining physical properties for the most luminous old galaxies over a range of redshifts will place new constraints on theories of their formation and early evolution.Integrated into this proposal are procedures to ensure wide and timely dissemination of the results, both within the scientific community and to interested lay audiences, and the project will provide material for both undergraduate teaching and general public outreach.***

基于标准的冷暗物质（CDM）理论的AST-0307335Stocktonsemi分析模型表明，红移一和第二之间形成的大多数椭圆星系，最近形成最大的椭圆星系。 但是，有一些观察结果对这张图片感到不安。 尽管可以通过对局部椭圆机进行仔细和详细的检查来解决一些问题，但是至关重要的是，在高红移处观察星系，其中已经在与这些红移相对应的时期已经老化的恒星种群（简称为“旧星系”）。 该项目的核心是在1.5到2.5之间以1.5至2.5之间的红移来获取一个重要且具有代表性的旧星系样本的图像，并且可能在3：4至3：8的范围内使用自适应光学器件（AO）在8 m级级别的望远镜上以分辨率分别提供三到四倍的分辨率。 重点是从已经存在深度光学数据的字段开始，以产生体积密度，聚类特性和形态的分布。 在一系列红移中识别和确定最具光性旧星系的物理特性，将对其形成和早期进化的理论构成新的限制。整合到这项建议中是确保在科学界和有兴趣的外行观众内广泛传播结果的程序，并且该项目将提供材料，并为材料提供材料，以提供不足的教学材料。