S22B0067
S22B0067
Lyα emission is used as a probe of reionization because Lyα photons are resonantly scattered by neutral hydrogen. Though the Lyα emission is severely attenuated by the neutral IGM in the epoch of reionization (EoR), recent studies report the discovery of strong Lyα emitters (LAEs) at z > 6. One exceptional example of the strong LAEs is the double-peaked Lyα emission, which is unexpected in the EoR. We have carried out the wide-field imaging survey with HSC to construct the LAE and Lyman break galaxy (LBG) samples at z=6.6. By comparing the distribution of LAEs and LBGs, the obtained reionization map suggests the spatially inhomogeneous reionization. Interestingly, we find that a bright double-peaked LAE, COLA1, is located in a high LAE density region, where reionization is expected to be proceeding. While this result is consistent with the picture that COLA1 resides in a Hii bubble, it is still unclear whether the ionized region is caused by COLA1 itself or the surrounding faint galaxies. If the neighboring LAEs are surrounded by a large ionized region, we would expect many of them have a double-peaked Lyα similar to COLA1, or higher Lyα EWs. We propose FOCAS spectroscopy for z=6.6 LAE candidates to search for the surrounding Hii bubble.
This document was translated from LATEX by HEVEA.