A JWST characterisation of hyper-luminous quasars at the epoch of reionization.

Outflows from active galactic nuclei (AGN) play a central role in galaxy evolution, yet their physical origins and scale connections remain unclear, especially at early cosmic times. At cosmic noon (z ~ 2–4), studies have shown evidence of a connection between small-scale nuclear winds traced by broad emission lines (e.g. C IV) and kpc-scale winds traced by [O III] in hyper-luminous quasars. However, such investigations have not been extended to the epoch of reionization (EoR), where supermassive black holes (SMBHs) are in their most rapid growth phase. I will present the first JWST/NIRSpec characterization of a sample of ~10 hyper-luminous quasars at z > 6, including sources from the HYPERION survey – a multiwavelength program targeting the most luminous quasars at EoR. We analyze rest-frame optical emission to characterise [O III] ?5007 properties and compare these to properties of rest-frame UV lines such as C IV, tracing the nuclear region. Through simultaneous spectral modeling of broad and narrow emission lines, we estimate black hole masses and investigate the dependence of [O III] ?5007 properties on AGN properties. We aim to test whether the correlations between nuclear winds and kpc winds observed at z ~ 2 persist into earlier epochs. This study sheds light on the nature of AGN feedback during the early assembly of galaxies and SMBHs. I will discuss the implications of the results from this study to models of AGN-driven feedback and SMBH–host galaxy co-evolution.