A massive narrowband imaging campaign searching for z ∼ 2 Lyα emitters (LAEs) in the fields traced by groups of strong intergalactic Hi Lyα absorption on a scale of 15 cMpc/h was carried out by using the Subaru/HSC NB387. A field among the sample, BOSS J0210, encounters a group of strong clustering quasars, i.e., 11 quasars down to MUV∼−23 detected by SDSS/eBOSS in (40 cMpc)3, which is the most significantly concentrated quasars at z>2 and the overdensity reaches δQSO∼30 at a significance of ∼ 17σ. Interestingly, the quasar overdensity is not located in the highest density peaks traced by LAEs but instead is inhabited at a large-scale filament that is extended for 100 cMpc. Various properties of the two nodes of this filament show bimodal features, and the quasars’ location is likely where transitions happen. However, due to the resonant nature of Lyα, possible interpretations have degenerated. Therefore, we propose this MOICRS/NB2083+Ks imaging survey to search for the more mature and resonance-free Hα emitters (HAEs). By inspecting the spatial distribution and properties of the different galaxy populations, we will get to understand better how quasar feedback affect/trace galaxy evolution and what triggers such intensive emergence of quasars.
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