SCUBA-2 obs of high-z quasars

Therefore, the excess of submillimeter sources is likely part of the Mpc-scale environment around these systems. By combining all fields and repeating the counts analysis in radial apertures, we find (at high significance >~5{sigma}) a decrease of the overdensity factor from >3 within ~2cMpc to ~2 in the annulus at the edge of the surveyed field (~10cMpc), suggesting that the physical extent of the overdensities is larger than our maps.

We computed preferred directions for the overdensities of SMGs from the positions of the sources, and used them to orient and create stacked maps of source densities for the quasars' environment. This stacking unveils an elongated structure reminiscent of a large-scale filament with a scale width of ~=3cMpc. Finally, the directions of the overdensities are roughly aligned with the major axis of the Ly{alpha} nebulae, suggesting that the latter trace, on hundreds of kpc, the central regions of the projected large-scale structure described by the SMGs on Mpc scales.

Confirming member associations of the SMGs is required to further characterize their spatial and kinematic distribution around ELANe and quasars.