Speaker
Description
Ultra-Fast Outflows (UFOs) are believed to be the nuclear drivers of AGN feedback, yet their properties at the peak of SMBH growth (z$\sim2-4$) remain largely unconstrained. WISSHFUL is a 2.3 Ms XMM-Newton Multi-year Heritage Program targeting 15 luminous (L$_{bol} > 10^{47}$ erg/s), non-lensed QSOs selected from the WISSH sample, complemented by coordinated NuSTAR Large Programs and rest-frame UV spectroscopic campaigns. I will present the first-year results from this program. In the super-Eddington QSO WISSH J0900+4215 ($z = 3.29$), we report the detection of a two-component UFO at v$_{out} \sim 0.1c$ and $\sim0.3c$ - the highest-redshift UFO discovered in a non-lensed QSO - with stratified variability and extreme energetics (E$_{kin}$ up $\sim10$% L$_{bol}$). The broadband XMM-Newton+NuSTAR analysis of the full year-1 sample (7 sources) reveals low high-energy cutoffs (E$_{cut} \sim 80$ keV), pointing to cold coronae in highly accreting sources, and extending the coronal temperature-$\lambda_{Edd}$ anticorrelation to unexplored luminosities. I will also discuss emerging connections between UV absorbers (BALs/NALs) and X-ray UFOs, offering a unified view of multi-phase nuclear winds at Cosmic Noon.