Astronomers from the University of Warwick have discovered evidence of a cosmic “digestive system” surrounding a black hole. Their observations of Swift J1727.8−1613 show that even when a black hole appears faint, it can continue expelling large amounts of matter instead of simply consuming everything around it.
Black holes are often portrayed as unstoppable cosmic predators. However, new observations of a powerful 2023 outburst led by Warwick Postdoctoral Fellow Dr. Noel Castro Segura reveal that black hole feeding is far more complex.
Using the European Southern Observatory’s Very Large Telescope (VLT), researchers monitored the black hole system Swift J1727.8−1613 throughout its dramatic eruption. The observations provide valuable insight into how black holes absorb, process, and eject matter.
Black Hole Outbursts Can Both Consume and Expel Matter
As the black hole pulled gas from a nearby companion star, it also expelled part of that material into space through powerful jets and winds. The research shows that these outflows can continue even after the black hole becomes extremely faint, at activity levels far below what scientists previously expected.
These findings suggest that black holes are not simply bottomless cosmic pits. Instead, they may function more like powerful cosmic digestive systems, drawing in matter, processing it, and returning a significant portion to space.
“People often imagine black holes simply swallowing everything around them,” said lead author Dr. Noel Castro Segura, a Postdoctoral Fellow at the University of Warwick. “What we’re seeing is a much more complex process. Matter falls in, the system processes it, and a surprising amount is expelled again.”
The study produced one of the most detailed optical records of a black hole outburst ever assembled. Instead of observing only a few isolated moments, astronomers tracked Swift J1727.8−1613 as it passed through several distinct stages of activity.
Swift J1727.8−1613 Reveals Black Hole Feeding in Real Time
Swift J1727.8−1613 was discovered after suddenly erupting in 2023, quickly becoming one of the brightest X-ray sources in the sky. The system contains a black hole that pulls gas from a nearby star, creating a rapidly rotating disc of superheated material.
Because the outburst was observed in exceptional detail, astronomers could follow the black hole’s feeding process as it evolved. Such events are rarely monitored with this level of quality across so many different stages.
One of the most significant discoveries occurred when the black hole launched a powerful jet. At the same time, the accretion disc supplying material to the black hole underwent major changes.
This offered researchers an unusually clear view of the connection between matter flowing inward toward a black hole and material being pushed outward into space.
Powerful Black Hole Winds Continued After the Outburst Faded
The most surprising result appeared after the black hole’s feeding frenzy had largely subsided. Even after Swift J1727.8−1613 dimmed to approximately one hundredth of its peak activity, astronomers detected dense gas continuing to flow away from the system.
The finding indicates that black holes can produce powerful outflows long after their brightest X-ray phase has ended. The amount of matter expelled may even be comparable to the amount of material eventually consumed by the black hole.
Reflecting on the black hole’s digestive process, Dr. Noel Castro Segura added, “If black holes can continue shedding material even after their largest outbursts, it means they may be much less efficient eaters than previously assumed. A significant fraction of the meal may never reach the black hole at all, changing our understanding of how binary star systems evolve within galaxies.”
Black Holes May Be Inefficient Cosmic Eaters
The observations add to growing evidence that black holes do more than consume matter. They are dynamic systems that can redistribute gas throughout their surroundings by pulling material inward and then ejecting a substantial portion through jets and powerful winds.
Commenting on the study, Kyle Solomons, a Doctoral Researcher at the University of Cape Town, said, “We usually focus on the dramatic fireworks when a black hole outburst begins, but our observations show that the finale can be just as intense. Even as the system’s X-ray emission fell to a fraction of its peak, it still had enough power to produce a massive expulsion of gas.”
By following Swift J1727.8−1613 through nearly the entire outburst, astronomers observed the full cycle of black hole feeding, transformation, and matter expulsion. The results offer one of the clearest views yet of how black holes consume material, respond to changing conditions, and influence the space around them.
Source: www.sciencedaily.com