JWST finds three active supermassive black holes in early galaxy
The discovery of a triple black hole system from 12.5 billion years ago suggests mergers accelerated the growth of the universe's first giants.
Astronomers have discovered three actively feeding supermassive black holes within a single distant galaxy, marking the first known instance of such a system in the early universe. The discovery, made using the James Webb Space Telescope (JWST), provides a rare glimpse into the chaotic growth of galactic cores shortly after the Big Bang.
The galaxy, designated J0148-4214, is being observed as it existed approximately 12.5 billion years ago, or roughly 1.2 billion years after the birth of the cosmos. Using the JWST's NIRSpec instrument, researchers identified three distinct black holes with vastly different scales: one estimated at 80 million solar masses, another at 2 million, and a third at 600,000 solar masses. Two of these black holes are positioned near the galactic center, separated by about 620 light-years, while the third resides in the outskirts, approximately 5,500 light-years from the center.
The mechanics of discovery
Typically, galaxies host a single supermassive black hole at their core. While triple systems have been identified in the nearby, modern universe, finding them in the distant past is significantly more challenging. The research team utilized the NIRSpec instrument's integral field unit to analyze gas motion patterns within J0148-4214. By distinguishing separate patterns of gas movement, astronomers confirmed the presence of three individual accreting black holes rather than a single, larger entity.
A fast-track for growth
This finding addresses a long-standing cosmological puzzle: how supermassive black holes reached such gargantuan sizes so quickly after the Big Bang. While black holes grow by accreting surrounding gas, this process alone may be too slow to explain the massive objects seen in the early universe.
According to Roberto Maiolino of the University of Cambridge, the presence of multiple black holes suggests that merging may serve as an additional, rapid route for growth. By colliding and combining, black holes can leap in mass far more quickly than through gas consumption alone. Hannah Übler, an astronomer at the Max Planck Institute for Extraterrestrial Physics, noted that this represents the first evidence of three active black holes in a single galaxy in the distant universe.
Future collisions
The system is not static. Current estimates suggest that the two central black holes are on a collision course and may merge within approximately 700 million years. As astronomers continue to use the JWST to survey the early universe, they expect to find more of these multi-black hole systems, further clarifying the role of galactic mergers in shaping the architecture of the cosmos.