Quasar "Predators" Halt Star Formation in Neighboring Galaxies Millions of Light-Years Away

University of Arizona researchers use JWST to prove that quasars emit radiation strong enough to stop star formation in galaxies millions of light-years away.

By: AXL Media

Published: Mar 30, 2026, 11:17 AM EDT

Source: Information for this report was sourced from the University of Arizona

The Concept of a Connected Galactic Ecosystem

For decades, the prevailing astronomical theory suggested that galaxies were islands in the vastness of space, evolving primarily through internal processes or direct collisions. However, new data from the James Webb Space Telescope has challenged this solitary model. Lead author Yongda Zhu and his team at the University of Arizona have proposed a "galaxy ecosystem" where the most powerful objects—supermassive black holes—influence the development of their neighbors. By emitting torrential winds and radiation, these active black holes can dictate the rate of star birth in galaxies located millions of light-years away, proving that cosmic evolution is a collaborative, interlinked process.

Quasars as High-Energy Star-Killers

At the heart of this phenomenon is the quasar, a phase where a supermassive black hole consumes surrounding gas and dust at an incredible rate. As this material spirals into the black hole, it forms an accretion disk that releases energy so intense it can outshine billions of stars. The study focused on J0100+2802, a quasar powered by a black hole 12 billion times the mass of the sun. The radiation produced during this "feeding" stage is not merely a light show; it is a destructive force that heats and splits molecular hydrogen—the primary building block of new stars—preventing it from collapsing into stellar nurseries.

Solving the James Webb Space Telescope Mystery

The discovery was prompted by a puzzling observation from JWST: regions surrounding the brightest early-universe quasars seemed to be "missing" galaxies. While astronomers expected to find dense clusters of young galaxies, the areas appeared remarkably empty. Zhu’s team realized the galaxies were not missing, but were simply too faint to be detected by traditional means because their star formation had been quenched. By measuring O III emissions—an ionized oxygen signal that tracks recent star births—the team confirmed that galaxies within a million-light-year radius of the quasar showed significantly suppressed activity compared to those further away.