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We present cosmological ($30-400$ Mpc) distributions of neutral hydrogen (HI)in the inter-galactic medium (IGM) traced by Ly$\alpha$ Emitters (LAEs) andQSOs at $z=2.1-2.5$, selected with the data of the on-going Hobby-EberlyTelescope Dark Energy Experiment (HETDEX) and the eBOSS survey. We investigatespatial correlations of LAEs and QSOs with HI tomography maps reconstructedfrom HI Ly$\alpha$ forest absorption in the spectra of background galaxies andQSOs obtained by the CLAMATO survey and this study, respectively. In thecosmological volume far from QSOs, we find that LAEs reside in regions ofstrong HI absorption, i.e. HI rich, which is consistent with results ofprevious galaxy-background QSO pair studies. Moreover, there is an anisotropyin the HI-distribution plot of transverse and line-of-sight distances; onaverage the HI absorption peak is blueshifted by $\sim 200$ km s$^{-1}$ fromthe LAE Ly$\alpha$ redshift, reproducing the known average velocity offsetbetween the Ly$\alpha$ emission redshift and the galaxy systemic redshift. Wehave identified a $\sim$ 40-Mpc scale volume of HI underdensity that is acandidate for a giant HII bubble, where six QSOs and an LAE overdensity existat $\left < z \right > =2.16$. The coincidence of the QSO and LAE overdensitieswith the HI underdensity indicates that the ionizing photon radiation of theQSOs has created a highly ionized volume of multiple proximity zones in amatter overdensity. Our results suggest an evolutionary picture where HI gas inan overdensity of galaxies becomes highly photoionized when QSOs emerge in thegalaxies.

astrophysical journal/the astrophysical journal

Cosmological 3D HI Gas Map with HETDEX Ly$\alpha$ Emitters and eBOSS  QSOs at $z=2$: IGM-Galaxy/QSO Connection and a $\sim$ 40-Mpc Scale Giant HII  Bubble Candidate