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

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视野来自无线电波长的观测。他们的计划是安装下一代射电望远镜的关键部件。这台望远镜将观测星系间气体的加热，这发生在星系中第一批恒星形成时。第一批星系中的第一批恒星距离太远，无法用可见光观测到，但可以用无线电波探测到。因为第一批星系是在很远的地方观测到的，所以发现无线电波的频率要低得多，这使得观测变得非常困难。研究人员将在两个关键方面做出贡献：1)研究极化校准和前景源对功率谱估计的影响；2)开发再电离纪元数据与其他数据集交叉相关的观测和分析技术。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。主要的具有更广泛影响的活动是一项新颖的活动，它超越了这一制度的传统努力，并特别与研究结合得很好。他们将把一个未使用的10米卫星天线改造成一个社区使用的射电望远镜，用于一个高度贫困的社区，这将用于高中的科学项目。这包括让学生参与重建这道菜。学生们将使用为实验开发的技术来探测星系的形成。

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.