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We conducted a systematic survey of the environment of high-z quasars atsubmillimeter wavelengths to unveil and characterize the surroundingdistribution of dusty submillimeter galaxies (SMGs). We took sensitiveJCMT/SCUBA-2 observations for 3 enormous Lyman-alpha nebulae (ELANe) and 17quasar fields in the redshift range 2<z<4.2 selected from recent Ly$\alpha$surveys. These observations uncovered 523 and 101 sources at 850$\mu$m and450$\mu$m, respectively, with S/N>4 or detected in both bands at S/N>3. We ranMonte Carlo simulations to construct 850$\mu$m number counts and unveil anexcess of sources in 75% of the targeted fields. Overall, regions around ELANeand quasars are overabundant with respect to blank fields by a factor of$3.4\pm0.4$ and $2.5\pm0.2$, respectively. Therefore, the excess of SMGs islikely part of the Mpc-scale environment around these systems. By combining allfields and repeating the count analysis in radial apertures, we find a decreasein the overdensity factor from >3 within $\sim 2$ cMpc to $\sim2$ at the edgeof the surveyed field ($\sim10$ cMpc), suggesting that the physical extent ofthe overdensities is larger than our maps. We computed preferred directions forthe overdensities of SMGs from the positions of the sources and used them toorient and create stacked maps of source densities for the quasars'environment. This stacking unveils an elongated structure reminiscent of alarge-scale filament with a scale width of $\approx 3$ cMpc. Finally, thedirections of the overdensities are roughly aligned with the major axis of theLy$\alpha$ nebulae, suggesting that the latter trace, on hundreds of kpc, thecentral regions of the projected large-scale structure described by the SMGs onMpc scales. Confirming member associations of the SMGs is required to furthercharacterize their spatial and kinematic distribution around ELANe and quasars.

astronomy and astrophysics

JCMT/SCUBA-2 uncovers an excess of $850\mu$m counts on megaparsec scales  around high-redshift quasars. Characterization of the overdensities and their  alignment with the quasars' Ly$\alpha$ nebulae