Full Breakdown
JWST Weighs Dormant Supermassive Black Hole 10 Billion Light-Years Away
6/7/2026, 11:52:01 PM
Core Discovery: Measuring a Silent Giant
Astronomers used JWST to measure the mass of a dormant supermassive black hole at the center of galaxy MRG-M0138, about 10 billion light-years away. Stellar motions near the core indicate a mass of roughly six billion solar masses. The galaxy, seen as it was when the universe was three billion years old, is no longer forming stars and its black hole is inactive.
Extending Stellar-Dynamics Techniques to the Early Universe
Stellar-dynamics mass measurements previously reached only ~700 million light-years. Here, a massive foreground galaxy cluster gravitationally lenses MRG-M0138, magnifying it ~30×. This natural lens, combined with JWST’s resolution, lets astronomers resolve the black-hole’s sphere of influence at a cosmological distance for the first time.
Researchers and Instruments
Lead author Andrew Newman of Carnegie Science directed the study. JWST’s Near-Infrared Spectrograph supplied stellar velocities; the lensing cluster provided magnification. Results are published in *Science*.
Measurements at a Glance
The black hole weighs ?6 × 109 M?; the galaxy lies ~10 billion light-years away; lensing magnifies it ~30×; MRG-M0138 is massive, quiescent, and lacks star formation.
Significance for Galaxy Evolution
The finding shows that the black-hole–galaxy mass relation seen locally already existed when the universe was young. MRG-M0138 likely hosted a bright quasar, and feedback from rapid black-hole growth may have halted later star formation.
Official Statements
Carnegie Science said that combining JWST imaging with gravitational lensing “provides one of the best techniques we have to weigh a black hole,” enabling measurements at an epoch previously out of reach. The team will apply the method to more high-redshift galaxies.
Verbatim Quotes
- “We were able to detect this black hole at a distance of 10 billion light years by combining JWST’s sharp vision with a natural magnifying glass,” — Andrew Newman, lead author, Carnegie Science
- “By combining JWST data with gravitational lensing, we could peer inside the black hole’s sphere of influence, where its gravity boosts the speeds of stars,” — Andrew Newman, lead author, Carnegie Science
- “This is one of the best techniques we have to weigh a black hole, so we were excited to extend it to a much earlier period in cosmic history.” — Andrew Newman, lead author, Carnegie Science
- “combining JWST's sharp vision with a natural magnifying glass,” — Andrew Newman, lead author, Carnegie Science
Future Outlook
The team will examine JWST data on similar objects, while Euclid and the Nancy Grace Roman Space Telescope should uncover many new strong-lensing systems. The Giant Magellan Telescope will later enable finer stellar-dynamics studies of distant galaxies, deepening insight into black-hole–galaxy co-evolution.
Gaps and Uncertainties
No contradictory mass measurements appear in the sources, but the sample currently consists of a single object, leaving open questions about the universality of early black-hole–galaxy scaling relations.
