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Measurements of QSO clustering in the SDSS show that $\mathrm{z}>4$ QSOs aresome of the most highly biased objects in the universe. Their large correlationlengths of $r_0 \sim 20h^{-1}$Mpc are comparable to the most massive clustersof galaxies in the universe today and suggest that these QSOs may mark thelocations of massive cluster progenitors at high redshift. We report thediscovery of an overdensity of LBGs around QSO SDSSJ114514.18+394715.9 as partof our survey to identify Lyman-Break galaxies (LBGs) around luminous$\mathrm{z}\sim4$ QSOs. In this field three of the eight LBGs with secureredshifts are consistent with the redshift of the QSO. We find that thelikelihood that this is merely an apparent overdensity due to the chanceselection of field galaxies is only 0.02%, based on comparisons to simulationsand our modeled selection efficiency. Overall, our survey finds four of the 15LBGs with secure redshifts are consistent with the redshifts of theirrespective QSOs, which is consistent with luminous QSOs residing in largerhaloes.

Discovery of an Overdensity of Lyman-alpha Emitters Around a $\mathrm{z}\sim4$ QSO with the Large Binocular Telescope