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Models and observations suggest that both power and effects of AGN feedbackshould be maximised in hyper-luminous (L_Bol>10^47 erg/s) quasars, i.e. objectsat the brightest end of the AGN luminosity function. We present the firstresults of a multi-wavelength observing program, focusing on a sample ofWISE/SDSS selected hyper-luminous (WISSH) broad-line quasars at z~1.5-5. TheWISSH quasars project has been designed to reveal the most energetic AGN-drivenoutflows, estimate their occurrence at the peak of quasar activity and extendthe study of correlations between outflows and nuclear properties up topoorly-investigated extreme AGN luminosities (L_Bol~10^47 -10^48 erg/s). Wepresent NIR, long-slit LBT/LUCI1 spectroscopy of five WISSH quasars atz~2.3-3.5 showing prominent [OIII] emission lines with broad (FWHM~1200-2200km/s) and skewed profiles. The luminosities of the broad [OIII] wings are thehighest measured so far (L_[OIII]^broad >~5x10^44 erg/s) and reveal thepresence of powerful ionised outflows with mass outflow rates Mdot >~1700M_Sun/yr and kinetic powers Edot >~10^45 erg/s. Although these estimates areaffected by large uncertainties, due to the use of [OIII] as tracer of ionizedoutflows and the very basic outflow model we assume, these results suggest thatthe AGN is highly efficient in pushing outwards large amounts of ionised gas inour targets. The mechanical outflow luminosities for WISSH quasars correspondto higher fractions (~1-3%) of L_Bol than those derived for lower L_Bol AGN.Our targets host very massive (M_BH>~2x10^9 M_Sun) black holes which are stillaccreting at a high rate (i.e. a factor of ~0.4-3 of the Eddington limit).These findings demonstrate that WISSH quasars offer the opportunity of probingthe extreme end of both luminosity and SMBH mass functions and revealingpowerful ionised outflows able to affect the evolution of their host galaxies.

The WISSH Quasars Project I. Powerful ionised outflows in hyper-luminous quasars