Abstract
We have used Gemini telescopes to study the photometric properties of four fields around the high-redshift quasar pairs QP1310+0007, QP1355-0032, QP0110-0219, and QP0114-3140z ∼ 1 with the aim of identifying large-scale structures -galaxy clusters or groups- around them. Our analysis reveals that QP0110-0219very strong and QP1310+0007 - QP1355-0032some evidence for the presence of rich galaxy clusters in direct vicinity of the pairs. On the other hand, QP0114-3140be an isolated pair in a poor environment. This work suggest that z ∼ 1 quasar pairs are excellent tracers of high density environments.
