CAREER: Characterizing the First Billion Years of Galaxy Evolution with 21 cm Tomography

职业：用 21 厘米断层扫描描绘银河系演化的第一个十亿年

• 批准号: 1455151
• 负责人: James Aguirre
• 金额: $ 57.47万
• 依托单位: University of Pennsylvania
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-05-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1455151&HistoricalAwards=false
• 关键词: CAREER; Characterizing; First; Billion; Years

The researcher will address a major question in Astronomy, understanding the first formation of galaxies. Our most distant vision of the universe comes from radio wavelength observations. Their plan is to implement critical components of the next generation radio telescope. This telescope will observe the heating of the gas between galaxies, which happened when the first stars in galaxies formed. These first stars in the first galaxies are too distant to be seen in optical light, but can be detected in radio waves. Because these first galaxies are seen from a great distance, the radio waves are found to be shifted to much lower frequencies, making these observations very difficult. The researcher will contribute to the study in two key ways: 1) investigating the effects of polarization calibration and foreground sources on power spectrum estimation and 2) developing the observational and analysis techniques to cross-correlate Epoch of Re-ionization data with other data sets. The critical goal is extracting cosmological information, and their approach is based on semi-analytic models of re-ionization galaxies.The primary broader impact activity is a novel one that goes beyond traditional efforts in this regime and was particularly well integrated with the research. They will convert an unused 10-m satellite dish into a community-use radio telescope in a high-poverty neighborhood, which will be used for high-school science projects. This includes involving students in the reconstruction of the dish. The students will use technology being developed for the experiment to detect the formation of galaxies.

研究人员将解决天文学中的一个主要问题，了解星系的第一次形成。 我们对宇宙最遥远的看法来自无线电波长观测。他们的计划是实施下一代射电望远镜的关键组件。 这架望远镜将观测星系之间气体的加热，这是星系中第一批恒星形成时发生的。 这些第一个星系中的第一颗恒星太遥远了，无法用可见光看到，但可以用无线电波探测到。 因为这些第一个星系是从很远的地方看到的，无线电波被发现转移到更低的频率，使得这些观测非常困难。研究人员将通过两种关键方式为这项研究做出贡献：1）调查偏振校准和前景源对功率谱估计的影响，以及2）开发观察和分析技术，以将再电离时期数据与其他数据集进行交叉关联。 关键目标是提取宇宙学信息，他们的方法是基于再电离星系的半解析模型。主要的更广泛的影响活动是一种新颖的活动，超越了这一领域的传统努力，特别是与研究相结合。他们将把一个未使用的10 m卫星天线改造成高度贫困社区的社区使用射电望远镜，用于高中科学项目。这包括让学生参与盘子的重建。学生们将使用正在开发的实验技术来探测星系的形成。