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We present the SILVERRUSH program strategy and clustering propertiesinvestigated with $\sim 2,000$ Ly$\alpha$ emitters at $z=5.7$ and $6.6$ foundin the early data of the Hyper Suprime-Cam (HSC) Subaru Strategic Programsurvey exploiting the carefully designed narrowband filters. We derive angularcorrelation functions with the unprecedentedly large samples of LAEs at $z=6-7$over the large total area of $14-21$ deg$^2$ corresponding to $0.3-0.5$comoving Gpc$^2$. We obtain the average large-scale bias values of $b_{\rmavg}=4.1\pm 0.2$ ($4.5\pm 0.6$) at $z=5.7$ ($z=6.6$) for $\gtrsim L^*$ LAEs,indicating the weak evolution of LAE clustering from $z=5.7$ to $6.6$. Wecompare the LAE clustering results with two independent theoretical models thatsuggest an increase of an LAE clustering signal by the patchy ionized bubblesat the epoch of reionization (EoR), and estimate the neutral hydrogen fractionto be $x_{\rm HI}=0.15^{+0.15}_{-0.15}$ at $z=6.6$. Based on the halooccupation distribution models, we find that the $\gtrsim L^*$ LAEs are hostedby the dark-matter halos with the average mass of $\log (\left < M_{\rm h}\right >/M_\odot) =11.1^{+0.2}_{-0.4}$ ($10.8^{+0.3}_{-0.5}$) at $z=5.7$($6.6$) with a Ly$\alpha$ duty cycle of 1 % or less, where the results of$z=6.6$ LAEs may be slightly biased, due to the increase of the clusteringsignal at the EoR. Our clustering analysis reveals the low-mass nature of$\gtrsim L^*$ LAEs at $z=6-7$, and that these LAEs probably evolve into massivesuper-$L^*$ galaxies in the present-day universe.

publications of the astronomical society of japan

Systematic Identification of LAEs for Visible Exploration and  Reionization Research Using Subaru HSC (SILVERRUSH). I. Program Strategy and  Clustering Properties of ~2,000 Lya Emitters at z=6-7 over the 0.3-0.5  Gpc$^2$ Survey Area