Overview
- The Cambridge‑led team published peer‑reviewed papers on May 27 that use JWST NIRSpec integral‑field data to make the first direct dynamical mass measurement of a black hole within the first billion years of the universe.
- By mapping tiny Doppler shifts across the glowing hydrogen disc with a spectroastrometry‑style analysis and using Abell 2744’s gravitational lensing to magnify the source, the team derived a Keplerian rotation curve that gives a black‑hole mass of about 50 million times the Sun.
- The measured black hole accounts for roughly two‑thirds of the system’s total mass, leaving at most a few tens of millions of solar masses in stars and making Abell2744‑QSO1 effectively a ‘naked’ black hole in a very small host.
- Composition maps show the gas is extremely metal poor, under 0.5% of the Sun’s metallicity, which indicates few prior generations of stars and a near‑pristine environment around the black hole.
- The result strengthens heavy‑seed formation scenarios such as direct collapse or primordial origins but has drawn skepticism and calls for independent reproduction and follow‑up observations with other teams and future facilities like the ELT to test how common such objects were.