3D Gas Tomography of Cosmic Large Scale Structure 10 Billion years Ago

在2018财年，我们发布了第一份由我领导和撰写的探测2.0<z<2.5星系间介质（IGM）的CLAMATO吸收层析成像调查的数据。与此同时，在这些数据中还发现了<z>~2.3的宇宙空洞，这标志着迄今为止观测到的最远的宇宙空洞样本。与此同时，我们还研究了利用IGM断层扫描数据估计潜在暗物质密度场的理论方法。描述基本方法的初步论文最近已经完成，表明该技术能够很好地恢复观测体积中的宇宙网结构。IGM层析成像的另一个应用是瞄准超亮类星体附近的体积来测量强类星体辐射对附近IGM结构的影响-也提交了第一篇描述方法的论文。在观测方面，我们设法在2019年1月和2月获得了额外的望远镜时间来获取更多的数据，这将使我们的观测足迹增加25%，并提高对该体积内大型星系原星团的覆盖范围。我们正在继续申请更多的望远镜时间，以进一步增加覆盖范围，最大限度地提高科学成果。这些结果正在为斯巴鲁望远镜上的定焦光谱仪提供调查科学定义，该望远镜将从2022年开始成为日本下一个主要的天文调查设施。

In FY2018, we published the first data release of the CLAMATO absorption tomography survey probing the 2.0<z<2.5 intergalactic medium (IGM), which I led and authored. This was accompanied by the detection of cosmic voids within this data at <z>~2.3, which marks the most distant sample of cosmic voids observed to-date. At the same time, we have also worked on theoretical methods to estimate the underlying dark matter density field using IGM tomography data. The initial paper describing the basic method has recently been completed, showing that this technique is able to recover well the cosmic web structure in the observational volume. Another application of IGM tomography is to target the volume near ultraluminous quasars to measure the effect of the intense quasar radiation on the nearby IGM structures - the first paper describing method has also been submitted.Observationally, we managed to get additional telescope time to obtain more data in January and February 2019, which will increase our observational footprint by 25% and improving coverage of the large galaxy protoclusters in that volume. We are continuing to apply for more telescope time to further increase the coverage and maximize the scientific yield.These results are feeding into the survey science definition for the Prime Focus Spectrograph on the Subaru Telescope, which will be Japan's next major astronomical survey facility starting from 2022.