An international team of astronomers has discovered three actively feeding supermassive black holes inside a single galaxy more than 12.5 billion light-years away. Observed as it was just 1.2 billion years after the Big Bang, the galaxy, designated J0148-4214, provides a remarkable snapshot of the early universe's chaotic processes.
The finding, led by the Max Planck Institute for Extraterrestrial Physics (MPE), marks the first time three active black holes have been confirmed in one galaxy from the distant universe. "This is the first evidence of three active black holes in a single galaxy in the distant Universe," said Hannah Uebler, research group leader at MPE and lead author of the study.
Two of the black holes lie near the galaxy's center, separated by a projected distance of just 620 light-years. The third sits much further out, approximately 5,500 light-years from the center. The researchers used the James Webb Space Telescope's NIRSpec-IFS instrument and a technique called spectro-astrometry to distinguish the distinct signatures of the three black holes, which would otherwise have appeared as a single source.
The black holes vary dramatically in size, with masses estimated at roughly 80 million, 600,000 and 2 million times that of the Sun. In a surprising twist, the black hole with a mass of 600,000 suns is feeding at a rate that exceeds the theoretical maximum predicted by basic models of black hole growth, known as the Eddington limit. This unusual feeding rate may offer clues to how some black holes grew so large so soon after the Big Bang. "The JWST data allowed us not only to identify the three black holes, but also to estimate their masses, accretion rates, and the stellar mass of the galaxy," said Dr. Giovanni Mazzolari of MPE.
The two central black holes are expected to merge within a few hundred million years. "These results are extremely exciting," added co-author Roberto Maiolino, a professor at the University of Cambridge. "They suggest that black hole merging may be an additional, fast route for their rapid growth in the early Universe." The nature of the third black hole remains a puzzle; it could be a remnant of an earlier merger kicked outward by a gravitational recoil, or it may be gradually moving toward the center to eventually interact with the other two.
Analysis
Why This Matters
- The discovery provides the first direct observational evidence of multiple active black holes merging in the early universe, a key proposed mechanism for the rapid growth of supermassive black holes.
- One of the black holes is feeding at a rate that challenges existing theoretical limits on black hole growth, forcing a re-evaluation of accretion models.
- It showcases the unique survey capabilities of the James Webb Space Telescope for uncovering hidden cosmic phenomena that were previously undetectable.
Background
Supermassive black holes, millions to billions of times the mass of the Sun, are thought to reside at the centers of most large galaxies. How they formed so quickly in the universe's first billion years is one of the great open questions in astrophysics. Leading theories propose rapid gas accretion and repeated galaxy mergers that bring black holes close enough to eventually merge. This discovery provides the strongest observational support yet for the merger-driven growth pathway in the early cosmos.
What to Watch
- Future gravitational wave observatories, such as the planned LISA mission, are expected to detect the types of mergers predicted between the two central black holes in this system.
- Further JWST surveys of other distant galaxies may reveal that such multiple-black-hole systems are more common than previously thought, helping to establish the frequency of this growth mechanism.
- Theoretical models of black hole accretion and the Eddington limit will likely be updated in light of the observed feeding rates of the smaller but rapidly growing black hole.
Checked
12 claims in this story checked against 1 source: 11 supported.
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- SupportedAstronomers found three actively feeding black holes in one ancient galaxy.Latest Science News -- ScienceDaily: “Astronomers have discovered three actively feeding supermassive black holes in a single galaxy more than 12.5 billion light-years from Earth.”
- SupportedThe James Webb Space Telescope revealed the trio from the dawn of the universe.Latest Science News -- ScienceDaily: “Using Webb's Near Infrared Spectrograph in its integral field spectroscopy mode (NIRSpec-IFS), the researchers were able to separate signals that would otherwise have appeared to come from a single black hole.”
- SupportedThe galaxy is more than 12.5 billion light-years away and is observed as it was 1.2 billion years after the Big Bang.Latest Science News -- ScienceDaily: “This means astronomers are observing it as it existed just 1.2 billion years after the Big Bang.”
- SupportedThe galaxy is designated J0148-4214.Latest Science News -- ScienceDaily: “The black holes are located in a galaxy known as J0148-4214.”
- Partly supportedThis is the first time three active black holes have been confirmed in one galaxy from the distant universe.Latest Science News -- ScienceDaily: ““This is the first evidence of three active black holes in a single galaxy in the distant Universe,” says Hannah Übler, research group leader at MPE and lead author of the study.”
- SupportedHannah Uebler said, “This is the first evidence of three active black holes in a single galaxy in the distant Universe.”Latest Science News -- ScienceDaily: ““This is the first evidence of three active black holes in a single galaxy in the distant Universe,” says Hannah Übler, research group leader at MPE and lead author of the study.”
- SupportedTwo black holes lie near the galaxy's center, separated by a projected 620 light-years; the third is about 5,500 light-years from the center.Latest Science News -- ScienceDaily: “Two of the black holes lie near the galaxy's center, separated by a projected distance of just 620 light-years. The third is much farther out, approximately 5,500 light-years from the center.”
- SupportedThe researchers used JWST's NIRSpec-IFS and spectro-astrometry to distinguish the three black holes' signatures, which otherwise would have appeared as one source.Latest Science News -- ScienceDaily: “To distinguish between them, the scientists used a precise measurement technique called spectro-astrometry.”
- SupportedThe black holes' estimated masses are roughly 80 million, 600,000 and 2 million solar masses.Latest Science News -- ScienceDaily: “According to the researchers' calculations, their masses are approximately 80 million, 600,000, and 2 million times that of the Sun.”
- SupportedThe 600,000-solar-mass black hole is feeding faster than the maximum predicted by basic growth models, the Eddington limit.Latest Science News -- ScienceDaily: “In fact, its estimated feeding rate exceeds the maximum predicted by basic models of black hole growth (the Eddington limit).”
- SupportedThe two central black holes are expected to merge within a few hundred million years.Latest Science News -- ScienceDaily: “The two black holes near the galaxy's center are expected to merge within the next few hundred million years.”
- SupportedThe third black hole could be a merger remnant kicked outward by gravitational recoil, or could be moving toward the center to interact with the other two.Latest Science News -- ScienceDaily: “Located well outside the galaxy's center, it could be a remnant of an earlier merger that was pushed outward by a powerful gravitational recoil. [...] Another possibility is that the third black hole is gradually moving toward the galaxy's center, where it may eventually interact with the other two.”
