S22B0059
S22B0059
Two most massive structures at the Cosmic Noon with peaks of δgal∼20 on 15 cMpc scales are found in a CFHT/WIRCam narrowband imaging survey searching for Hα emitters (HAEs) in the regions traced by the intergalactic coherently strong Lyα absorption systems (CoSLAs). The CoSLAs are searched from the entire SDSS-III/BOSS quasar spectra database covering the sky area of 10,000 deg2, and such a large searching volume allows us to find the most extreme structures. Also, thanks to the wide FoV of WIRCam, the two structures are mapped on ∼ 26′×26′ area, which is 10× larger than the existing dual-emission surveys for Lyα and Hα at similar redshifts. To better understand the mass assembly on a large scale, we propose to perform deep and wide Subaru/HSC NB395 and g-band imaging observation to select the Lyα emitters (LAEs) down to the luminosity of 0.3 × LLyα*. The pointing is centered at the WIRCam footprints to fully map the entire overdense structure, including its outskirts, out to tens of cMpc. For the first time, we will study the distribution difference between LAEs and HAEs on ∼40 cMpc scales in the massive structures. With CoSLAs, we will also get a profound insight into how different galaxy populations trace the underlying structures.
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