Quasars Probing Quasars
Jason Prochaska

I will discuss the Quasars Probing Quasars survey which is a spectroscopic campaign of close, z>2 quasar pairs discovered in SDSS, BOSS, and dedicated follow-up programs. Emphasis of this talk will be on using these pairs to study the circumgalactic medium (CGM) of the massive z~2 galaxies "tagged" by an active quasar. The results constrain the processes of inflow and outflow onto these massive galaxies, formation scenarios for the intragroup medium, and models for the radiative emission (and feedback effects) of bright AGN.