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We report on a study of the galaxy environments of low redshift physicalquasars pairs. We selected 20 pairs having projected separation $<$ 0.5 Mpc anddifference of systemic velocity $<$ 800 km s$^{-1}$. Using Sloan Digital SkySurvey images we evaluated the galaxy overdensity around these quasars in pairsand then compare it with that of a sample of isolated quasars with sameredshift and luminosity. It is found that on average there is a systematiclarger overdensity of galaxies around quasars in pairs with respect to that ofisolated quasars. This may represent a significant link between nuclearactivity and galaxy environment. However, at odds with that, the closest quasarpairs seem to inhabit poorer environments. Implications of present results andperspectives for future work are briefly discussed.

Overdensity of galaxies in the environment of quasar pairs