Probing the merger-induced feedback scenario in hyper-luminous quasars

We are following up through multiwavelength observations the WISSH sample ofhyperluminous MIRselected Type 1 quasars at zvirgul2.53.5. In these objects weexpect powerful quasar feedback and galaxy mergers to manifest themselves infull force. We are finding the WISSH quasars to exhibit a mixture of twopopulations with powerful winds in different gas phases (OIII or CIV). They alsoseem to show a dichotomy in their Xray luminosities and UV/Xray slope. Wepropose here XMM and HST observations of three WISSH quasars showing powerfulOIII outflows in order to establish whether (i) they have higher XraytoMIRand XraytoUV luminosity ratios compared to the CIVwind population and (ii)powerful quasars in the blowout phase are linked to mergers. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]