Using Lyman Alpha Galaxies to Understand Galaxy Formation and Cosmological Reionization

使用莱曼阿尔法星系了解星系形成和宇宙再电离

• 批准号: 0808165
• 负责人: James Rhoads
• 金额: $ 39.74万
• 依托单位: Arizona State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-08-01 至 2012-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0808165&HistoricalAwards=false
• 关键词: Using; Lyman; Alpha; Galaxies; Understand

AST-0808165RhoadsLyman-alpha emission has long been predicted as a signpost of primitive galaxies in formation. This project will characterize the nature and evolution of Lyman-alpha galaxies by: (1) determining the mass and ages of the stellar populations in these galaxies by narrow-band imaging; (2) using the results of the largest area Lyman-alpha search to date to determine the halo occupation distribution of galaxies and the duty cycle of Lyman-alpha emission; (3) determining the evolution in properties of Lyman-alpha galaxies as a function of redshift; (4) determining the epoch, pace and inhomogeneity of reionization; and (5) using near-infrared surveys to obtain Lyman-alpha galaxy constraints on the IGM neutral fraction at redshifts 7.7 and 8.8. These surveys complement results from the Gunn-Peterson test and the microwave background polarization measurements, and are expected to discover some eighty galaxies.The anticipated discovery of the 'most distant galaxy', or even a whole population of them, could generate significant publicity. Results will be included in courses at ASU, which is committed to encouraging under-represented groups in science, especially Native American and Hispanic students. Filters provided for this study will be available to the whole community, as will the reduced data and any improvements added to the data processing pipeline. This will benefit a whole community of users.

AST-0808165 RhoadsLyman-α发射一直被预测为原始星系形成的标志。 该项目将通过以下方式确定Lyman-alpha星系的性质和演化：（1）通过窄带成像确定这些星系中恒星群的质量和年龄;（2）利用迄今为止最大面积Lyman-alpha搜索的结果确定星系的晕占据分布和Lyman-alpha发射的占空比;（3）确定Lyman-alpha星系的性质随红移的演化：（4）确定再电离的年代、速度和不均匀性;（5）利用近红外巡天观测获得了莱曼α星系对IGM中性部分在红移7.7和8.8处的约束。 这些巡天观测补充了冈恩-彼得森试验和微波背景偏振测量的结果，预计将发现大约80个星系。“最遥远星系”的预期发现，甚至是整个星系群的发现，都可能产生重大的公众效应。 结果将包括在亚利桑那州立大学的课程，这是致力于鼓励在科学代表性不足的群体，特别是美洲原住民和西班牙裔学生。 为这项研究提供的过滤器将提供给整个社区，减少的数据和增加到数据处理管道的任何改进也将提供给整个社区。 这将使整个社区的用户受益。