088620

The growth of Supermassive Black Holes powering luminous quasars at the Epoch of Reionization (EoR z and amp amp amp gt 6) is a hot topic in astrophysics. These quasars are being characterized with large multiwavelength campaigns with current flagship observatories. X-ray observations performed so far provided mostly and amp amp amp lt 15 counts in 0.5-10 keV spectra and thus a poor characterization of their properties. We propose HYPERION a 2.3 Ms Multi-Year Heritage programme to dramatically improve data quality to 100 counts for 15 luminous quasars at EoR delivering unprecedented constraints on nuclear properties accretion ejection disc/corona complex. It will nicely complement observations at other wavelengths enabling meaningful X-ray spectroscopic studies at EoR to begin. [truncated! Please see actual data for full text]