Detecting hydrogen in the early universe using the Large Aperture Experiment to Detect the Dark Age (LEDA) telescope

该计划的目标是测量氢（HI）在再电离时代（EoR）期间发射的21cm波长的信号，并红移到非常低的无线电频率（约70 MHz）。EoR是一个新恒星和黑洞将宇宙从大部分中性转变为大部分电离的时期，是宇宙历史上最后一个有待探索的领域之一。更广泛的影响包括培养天文仪器方面的研究生和博士后。此外，他的团队将开发开源的、在线的、主动学习的工具，这些工具使用的是来自云的Jupyter笔记本的新技术。这将支持在浏览器窗口中执行交互式混合文本和图形材料的表示。该技术可能适用于所有STEM领域。研究人员将使用他们自己的仪器，大孔径实验探测黑暗时代（LEDA），试图从EoR的红移近20处探测HI天空平均吸收光谱。LEDA是位于加利福尼亚中部欧文斯谷射电天文台的欧文斯谷长波阵的一部分。

The goal of this program is to measure the signal of hydrogen (HI) 21cm wavelength emission originating during the Epoch of Reionization (EoR) and redshifted to very low radio frequencies (about 70 MHz). The EoR was a period when new stars and black holes transformed the universe from being largely neutral to being largely ionized, and is one of the last frontiers in the history of the universe yet to be explored. Broader impacts include training of graduate students and postdocs in astronomical instrumentation. In addition, he team will develop open-source, online, active-learning tools using the new technology of Jupyter notebooks served from the Cloud. This will enable presentation of interactive mixed text and graphical materials that execute in browser windows. The technology is potentially applicable to all STEM fields.The investigators will use their own instrument, the Large Aperture Experiment to Detect the Dark Age (LEDA), to attempt to detect the HI sky-averaged absorption spectrum from the EoR at redshifts near 20. LEDA is part of a larger instrument called the Owens Valley Long Wavelength Array, located at the Owens Valley Radio Observatory in central California.