CHORUS. IV. Mapping the Spatially Inhomogeneous Cosmic Reionization with Subaru HSC

Abstract Spatial inhomogeneity is one of the important features for understanding reionization process; however, it has not yet been fully quantified. To map this inhomogeneous distribution, we simultaneously detect Ly α emitters (LAEs) and Lyman-break galaxies (LBGs) at z ∼ 6.6 from Subaru/Hyper Suprime-Cam large-area (∼1.5 deg 2 = 34,000 cMpc ) deep survey. We estimate neutral fraction, x HI , observed number density ratio LAEs to LBGs, n (LAE)/ (LBG), using numerical radiative transfer simulations, in which model are selected satisfy selection function. While average within field view found be < 0.4, consistent with previous studies, variation (LBG) every 140 pMpc area as large a factor 3. This may suggest spatially topology reionization, but also leaves open possibility that based on inherent large-scale structure galaxy distribution. Based difficult distinguish between two current find high-LAE-density region more numerous high EW 0 supporting fact or less driven by though statistical significance high.