XRISM captures sharpest X-ray spectrum of rapidly spinning black hole

The XRISM mission has captured the sharpest X-ray spectrum of a rapidly spinning black hole, MCG–6-30-15. This breakthrough, achieved by combining XRISM data with XMM-Newton and NuSTAR, isolates emission lines near the black hole's event horizon, confirming its rapid spin. The findings provide crucial insights into black hole physics and the evolution of galaxies, resolving previous limitations in X-ray telescope resolution.