Young Galaxies

年轻的星系

• 批准号: 9616863
• 负责人: Trinh Thuan
• 金额: $ 5万
• 依托单位: University of Virginia Main Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-05-01 至 2001-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9616863&HistoricalAwards=false
• 关键词: Young; Galaxies

Thuan, Trinh Xuan 96-16863 Dr. Thuan will continue a collaboration with scientists from Unkraine and Russia to study nearby galaxies which are extremely metal- deficient blue compact galaxies. The first research goal is to obtain a high precision measure of the primordial helium abundance for a sample of candidate blue compact galaxies. The primordial He abundance constitutes one of the most promising ways to constrain the standard Big Bang nucleosynthesis theory and the chemical evolution models of blue compact dwarf galaxies. The second goal is to study the extended HI envelopes around young blue compact galaxies. These are good candidates for being primordial neutral hydrogen intergalactic clouds, which will be studied to help understand why star formation has been stunted for so long in these envelopes.

Thuan， Trinh Xuan 96-16863 Thuan博士将继续与来自乌克兰和俄罗斯的科学家合作，研究附近极度缺乏金属的蓝色致密星系。第一个研究目标是获得候选蓝色致密星系样本的原始氦丰度的高精度测量。原始氦丰度是约束标准大爆炸核合成理论和蓝致密矮星系化学演化模型的最有希望的方法之一。第二个目标是研究年轻的蓝色致密星系周围扩展的HI包层。这些是原始中性氢星系间云的很好候选者，它们将被研究以帮助理解为什么恒星形成在这些包层中被阻碍了这么长时间。