宇宙学3D HI气体图，带有HETDEX Ly $α$发射器和$z=2$上的eBOSS类星体：IGM-银河系/类星体连接和$\sim$ 40 Mpc尺度巨型HII候选气泡
Cosmological 3D HI Gas Map with HETDEX Ly$α$ Emitters and eBOSS QSOs at $z=2$: IGM-Galaxy/QSO Connection and a $\sim$ 40-Mpc Scale Giant HII Bubble Candidate
摘要：
利用正在进行的Hobby-Eberly望远镜暗能量实验（HETDEX）和eBOSS巡天观测数据，给出了银河系间介质中性氢（HI）的宇宙学（$30-400$ Mpc）分布，并利用$z=2.1-2.5$上的Ly $α$发射体（LAEs）和类星体进行了追踪.我们调查的LAEs和类星体的空间相关性HI层析成像地图重建从HI Ly $α$森林吸收的背景星系和类星体的CLAMATO调查和这项研究，分别获得的光谱。在远离类星体的宇宙学体积中，我们发现LAEs存在于强HI吸收的区域，即HI丰富的区域，这与以前的星系背景类星体对研究的结果是一致的。此外，有一个各向异性的横向和视线距离的HI分布图，平均HI吸收峰蓝移$\sim 200$公里的$^{-1}$从LAE的Ly $α$红移，再现已知的平均速度之间的偏移Ly $α$发射红移和星系系统红移。我们已经确定了一个$\sim$ 40-Mpc的HI低密度的尺度体积，这是一个巨大的HII泡沫，其中六个类星体和LAE高密度存在于$\left < z \right > =2.16$的候选人。类星体和LAE的高密度与HI低密度的重合表明，类星体的电离光子辐射在物质高密度中产生了多个邻近区的高度电离体积。我们的研究结果表明，当类星体出现在星系中时，在过密星系中的HI气体变得高度光电离。
英文摘要：
We present cosmological ($30-400$ Mpc) distributions of neutral hydrogen (HI) in the inter-galactic medium (IGM) traced by Ly$α$ Emitters (LAEs) and QSOs at $z=2.1-2.5$, selected with the data of the on-going Hobby-Eberly Telescope Dark Energy Experiment (HETDEX) and the eBOSS survey. We investigate spatial correlations of LAEs and QSOs with HI tomography maps reconstructed from HI Ly$α$ forest absorption in the spectra of background galaxies and QSOs obtained by the CLAMATO survey and this study, respectively. In the cosmological volume far from QSOs, we find that LAEs reside in regions of strong HI absorption, i.e. HI rich, which is consistent with results of previous galaxy-background QSO pair studies. Moreover, there is an anisotropy in the HI-distribution plot of transverse and line-of-sight distances; on average the HI absorption peak is blueshifted by $\sim 200$ km s$^{-1}$ from the LAE Ly$α$ redshift, reproducing the known average velocity offset between the Ly$α$ emission redshift and the galaxy systemic redshift. We have identified a $\sim$ 40-Mpc scale volume of HI underdensity that is a candidate for a giant HII bubble, where six QSOs and an LAE overdensity exist at $\left < z \right > =2.16$. The coincidence of the QSO and LAE overdensities with the HI underdensity indicates that the ionizing photon radiation of the QSOs has created a highly ionized volume of multiple proximity zones in a matter overdensity. Our results suggest an evolutionary picture where HI gas in an overdensity of galaxies becomes highly photoionized when QSOs emerge in the galaxies.
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