At the peak of star formation, 12 billion years ago, quasar WISSH13 was ejecting two streams of matter at near-light speeds. Analysis of XMM-Newton and NuSTAR data revealed a cold corona and powerful reflection—a sure sign of accretion at the Eddington limit. These ultrafast winds, with kinetic powe
arXiv:2606.05312v1 · 2026-06-03