RAISING THE LUMINOSITY BAR: BROAD-BAND X-RAY VIEW OF THE MOST LUMINOUS UNOBSCURE

The highenergy emission of AGNs is mostly studied in nearby Seyferts. BrightQSOs, on the other hand, offer the opportunity to study accretion processes andAGNdriven winds in the less explored high luminosity regime. We propose a jointNuSTAR and XMM (100 ks) observation of HE 10291401, the most Xray luminous AGNamong local (z<0.1) unobscured, radioquiet QSOs, and a very intriguing sourceshowing a significant soft excess and a broad iron line. The unique jointcapabilities of NuSTAR and XMM will allow us to constrain the properties of theXray corona, to assess the contribution of relativistic reflection, and todetermine the nature of the soft excess. We will also be able to search forXray winds, such as warm absorbers and more powerful ultrafast outflows. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]