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Mukae, Shiro; Ouchi, Masami; Hill, Gary J.; Gebhardt, Karl; Cooper, Erin Mentuch; Jeong, Donghui; Saito, Shun; Fabricius, Maximilian; Gawiser, Eric; Ciardullo, Robin; Farrow, Daniel; Davis, Dustin; Zeimann, Greg; Finkelstein, Steven L.; Gronwall, Caryl; Liu, Chenxu; Zhang, Yechi; Byrohl, Chris; Ono, Yoshiaki; Schneider, Donald P.; Jarvis, Matt J.; Casey, Caitlin M. and Mawatari, Ken (2020): Cosmological 3D H I Gas Map with HETDEX Ly alpha Emitters and eBOSS QSOs at z=2: IGM-Galaxy/QSO Connection and a similar to 40 Mpc Scale Giant H ii Bubble Candidate. In: Astrophysical Journal, Vol. 903, No. 1, 24

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We present cosmological (30-400 Mpc) distributions of neutral hydrogen (H I) in the intergalactic medium (IGM) traced by Ly alpha emitters (LAEs) and QSOs at z = 2.1-2.5, selected with the data of the ongoing Hobby-Eberly Telescope Dark Energy Experiment (HETDEX) and the eBOSS survey. Motivated by a previous study of Mukae et al., we investigate spatial correlations of LAEs and QSOs with H I tomography maps reconstructed from H I Ly alpha 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 H Ii absorption, i.e., H I rich, which is consistent with results of previous galaxy-Background: QSO pair studies. Moreover, there is an anisotropy in the H I distribution plot of transverse and line-of-sight distances;on average the H II absorption peak is blueshifted by similar to 200 km s(-1) from the LAE Ly alpha redshift, reproducing the known average velocity offset between the Ly alpha emission redshift and the galaxy systemic redshift. We have identified a similar to 40 Mpc scale volume of H i underdensity that is a candidate for a giant H II bubble, where six QSOs and an LAE overdensity exist at < z > = 2.16. The coincidence of the QSO and LAE overdensities with the H I 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 H I gas in an overdensity of galaxies becomes highly photoionized when QSOs emerge in the galaxies.

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