Postdoctoral Fellowship: AAPF: Probing the Cosmic Dawn with the OVRO-LWA

博士后奖学金：AAPF：用 OVRO-LWA 探索宇宙黎明

• 批准号: 2303952
• 负责人: Ruby Byrne
• 金额: $ 33万
• 依托单位: Byrne, Ruby
• 依托单位国家: 美国
• 项目类别: Fellowship Award
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-09-01 至 2026-08-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2303952&HistoricalAwards=false
• 关键词: Postdoctoral; Fellowship; AAPF; Probing; Cosmic

Ruby Byrne is awarded an NSF Astronomy and Astrophysics Fellowship to carry out a program of research and education at the California Institute of Technology. Byrne will use emission from neutral hydrogen to study the Cosmic Dawn, the phase in cosmological history when stars and galaxies first formed. She will also lead a summer research program for high school students and undergraduates that will expose students to astronomical data analysis techniques and prepare them for careers in science.This project employs the OVRO-LWA, a radio array in California’s Owens Valley that operates at frequencies of 12-85 MHz. The upgraded OVRO-LWA Stage III array is sensitive to highly redshifted signals from neutral hydrogen’s 21 cm emission line, which trace the intergalactic medium during the Cosmic Dawn and Epoch of Reionization. Byrne will implement novel precision data analysis techniques to produce three key science results: (1) a measurement of the sky-averaged 21 cm spectrum, (2) the strongest constraints to date on the power spectrum of 21 cm fluctuations during the Cosmic Dawn, and (3) high-fidelity, polarized maps of the low-frequency radio sky. These results will illuminate the dynamics of early galaxy formationmand test models of cosmological evolution.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

露比·伯恩（Ruby Byrne）被授予NSF天文学和天体物理学奖学金，以在加利福尼亚理工学院进行研究和教育计划。伯恩（Byrne）将利用中性氢的发射来研究宇宙黎明，这是恒星和星系首次形成的宇宙学历史的阶段。她还将领导一项针对高中生和本科生的夏季研究计划，该计划将使学生接触天文数据分析技术并为科学的职业做好准备。该项目采用Ovro-LWA，这是加利福尼亚欧文斯山谷的无线电阵列，在加利福尼亚的欧文斯山谷（Owens Valley）的频率为12-85 MHz。升级后的OVRO-LWA III期阵列对中性氢的21 cm发射线的高度红移信号敏感，该信号在宇宙黎明和电离时期追踪呈乳突间介质。伯恩（Byrne）将实施新颖的精确数据分析技术来产生三个关键的科学结果：（1）测量21 cm光谱的天空平均值，（2）迄今为止在宇宙黎明期间21 cm波动的强大限制下，以及（3）高利益，高偏光广播天空的高利润图。这些结果将阐明宇宙学进化的早期星系组测试模型的动态。该奖项反映了NSF的法定任务，并使用基金会的知识分子优点和更广泛的影响审查标准，被认为值得通过评估来获得支持。