The WISE/SDSS-selected hyper-luminous quasar (WISSH) survey is an extensive multi-band observing program (from millimeter wavelengths to hard X-rays) to investigate the role of nuclear activity in SMBH-galaxy self-regulated growth via extended outflows. Our ongoing project is designed to accurately probe the relationship between nuclear and host galaxy ISM properties in a unique sample of ~ 90 quasars at the brightest end of the AGN luminosity function (i.e., bolometric luminosity Lbol> 8e13 Lsun), and at the peak of their number density (z ~2-4). This OAR-led project involves more than twenty researchers from Italy and foreign institutions.

The most relevant results obtained to date by WISSH can be summarized as follows:

• the  discovery of highly accreting (i.e., Eddington ratios of ~0.3-3), ten billion solar masses SMBHs producing extremely powerful (up to ~ 4% of the bolometric luminosity), large-scale, ionized outflows;

• the co-existence of very intense star formation rates (SFR up to few thousands solar masses per year) and prodigious AGN luminosities;

•  the relative X-ray weakness of WISSH quasars when compared to IR and optical properties, with respect to less powerful, well-studied AGN typically sampled in medium/deep survey fields. 

• the discovery of very fast winds in the BLR detected by the study of the CIV line profile which show a velocity anti-correlated with the strength of the X-ray emission

The WISSH project is based on both proprietary & public JVLA, ALMA, NOEMA, Herschel/SPIRE, WISE, ESO/SINFONI, ESO/X-Shooter, ESO/MUSE, LBT/LUCI, TNG, 2MASS, HST, SDSS, Chandra and XMM-Newton data

Scientific Coordinator: E. Piconcelli (INAF- OAR)

Leader of Optical-UV data analysis: G. Vietri (INAF-IASF) 

Leader of submm/IR data analysis: M. Bischetti (U. Trieste)

Leader of radio data analysis: G. Bruni (INAF-IAPS)