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We present deep observations of CO(3-2) from the Cloverleaf lensedquasar-starburst at $z=2.56$. We discover a 4-5 times less massive companion ata projected distance of 33 kpc from the Cloverleaf host galaxy. The galaxiesare connected by a bridge of CO emission, indicating that they are interactingand that the companion is being stripped by the Cloverleaf. We also findevidence for fast molecular gas in the spectral line of the Cloverleaf that maybe an outflow induced by stellar or quasar feedback. All of these features maybe ubiquitous among quasars and only detected here with the help ofgravitational lensing and the sensitivity of the data. Overall, these findingsagree with galaxy formation scenarios that predict gas-rich mergers play a keyrole in quasar triggering, starburst triggering and the formation of compactspheroids.

Luck of the Irish? A companion of the Cloverleaf connected by a bridge of molecular gas