S20B0040abst
S20B0040
We propose the wide-field survey of the Hα emitters (HAEs) across the ∼30Mpc-scale large-scale structure traced by the Lyα emitters (LAEs) around the USS 1558 protocluster. While a handful of protoclusters have been found via the LAE surveys at z>3 today, it is still not clear whether and how the detected local excess of the LAEs can trace the underlying mass structure. Our published study of the HAEs and LAEs at the center of the USS 1558 protocluster at z=2.5 shows that, while the density enhancement of LAEs seems to point the high-density region of the HAEs on large scale (∼10 Mpc), they apparently avoid the densest group of the HAEs in a smaller scale (Shimakawa et al. 2017, MNRAS, 468, L21). The HAEs are expected to be much less-biased tracer of the distribution of the star-forming galaxies compared to the LAEs (that are easily affected by dust extinction). Thus, our result implies that the current picture of the universe at z>3, which largely relies on the LAEs, could be significantly biased. Clearly we need more sample to confirm the trend. The proposed observation is the first attempt of such comparison over significantly wide scale and sample size. It will give a profound insight on the current and the future exploration of the high-z universe.
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