An Impossible Discovery in the Early Universe
Astronomers utilizing the James Webb Space Telescope (JWST) have made a startling discovery: the most ancient pair of supermassive black hole-powered quasars ever documented. This finding presents a significant challenge to current scientific models, as these massive objects appear to exist at a time when, theoretically, they should not yet have had the opportunity to form.
The system, cataloged as J1602+4228AB and dubbed Nāpōwawāʻenakaulua, originates from approximately 900 million years after the Big Bang. In Hawaiian, the name reflects the concept of “two celestial bodies of fathomless powerful darkness in the brilliance of heat reincarnating energy into the universe.”
Unprecedented Compactness and Mass
This discovery is notable not only for its extreme age but also for the proximity of the two black holes. They are separated by only 18,100 light-years—a distance roughly equal to one-fifth the diameter of the Milky Way. With masses estimated at 1.5 billion and 400 million times that of our sun, this pairing represents the most compact quasar system identified from the era of Cosmic Dawn.
As Silvia Onorato, research team leader from NOIRLab, noted in a statement:
«There is no definitive theoretical explanation for how a single one of these giant quasars exists so early in the age of our universe, much less two. We observed Nāpōwawāʻenakaulua at a time when the universe was only a thirteenth of its age and, astonishingly, its supermassive black holes are just as massive as those we see today.»
Challenging Cosmic Growth Models
Quasars are fueled by accretion disks—swirling regions of gas and dust feeding supermassive black holes. The intense friction generated within these disks produces light that often outshines entire galaxies. While identifying quasars is common, finding compact pairs is rare due to the short duration of the “quasar phase” and the technical difficulties of resolving such distant, tightly packed objects.
The core issue is time. Standard models suggest that black holes require at least one billion years of feeding and merging to achieve such extreme masses. However, since its launch in 2022, the JWST has repeatedly detected supermassive black holes dating back to just 400 million years after the Big Bang. The discovery of Nāpōwawāʻenakaulua—the third such pair found from the Cosmic Dawn—further suggests that our understanding of early black hole growth may be incomplete.
Advancing Our Understanding of Galaxy Formation
The system was identified through the JWST’s Aether survey, which utilizes the NIRSpec instrument to catalog early universe objects. By analyzing the Aether dataset, researchers realized that J1602+4228A possessed a previously unknown companion, J1602+4228B. Confirmation of these distinct bodies was made possible by the Gemini North telescope, aided by favorable atmospheric conditions atop Maunakea in Hawai'i.
While the existence of this pair remains a mystery, it offers a unique opportunity for research. Onorato emphasized the significance of the find:
«Nāpōwawāʻenakaulua is a really unique environment. It's a laboratory for astronomers to study how the very first massive galaxies and their central black holes assembled together through direct galaxy interactions during these early times.»
The team’s findings were detailed in The Astrophysical Journal Letters on November 10.