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We report fourteen and twenty-eight protocluster candidates at z=5.7 and 6.6over 14 and 19 deg^2 areas, respectively, selected from 2,230 (259) Lyaemitters (LAEs) photometrically (spectroscopically) identified withSubaru/Hyper Suprime-Cam (HSC) deep images (Keck, Subaru, and Magellan spectraand the literature data). Six out of the 42 protocluster candidates include1-12 spectroscopically confirmed LAEs at redshifts up to z=6.574. By thecomparisons with the cosmological Lya radiative transfer (RT) model reproducingLAEs with the reionization effects, we find that more than a half of theseprotocluster candidates are progenitors of the present-day clusters with a massof > 10^14 M_sun. We then investigate the correlation between LAE overdensitydelta and Lya rest-frame equivalent width EW_Lya^rest, because the cosmologicalLya RT model suggests that a slope of EW_Lya^rest-delta relation is steepenedtowards the epoch of cosmic reionization (EoR), due to the existence of theionized bubbles around galaxy overdensities easing the escape of Lya emissionfrom the partly neutral intergalactic medium (IGM). The available HSC datasuggest that the slope of the EW_Lya^rest-delta correlation does not evolvefrom the post-reionization epoch z=5.7 to the EoR z=6.6 beyond the moderatelylarge statistical errors. There is a possibility that we would detect theevolution of the EW_Lya^rest - delta relation from z=5.7 to 7.3 by the upcomingHSC observations providing large samples of LAEs at z=6.6-7.3.

astrophysical journal/the astrophysical journal

SILVERRUSH. VII. Subaru/HSC Identifications of 42 Protocluster  Candidates at z~6-7 with the Spectroscopic Redshifts up to z=6.574:  Implications for Cosmic Reionization