Catching a black hole in the act of feeding is a rare privilege for astronomers. This time, they managed it.
Over the course of nearly eight hours, the James Webb Space Telescope held its gaze on the heart of a faraway galaxy and captured something that almost always slips past observers: the entire journey a black hole’s next meal takes as it moves inward. Not the leftovers — the delivery route itself.
The target was the biggest galaxy in its cluster
The campaign centered on NGC 4696, the largest galaxy sitting at the center of the Centaurus Cluster. Located about 145 million light-years away from Earth, its distance alone makes the resolution achieved here all the more striking.
An international group of scientists trained Webb’s NIRSpec instrument on the galaxy and observed. NIRSpec picks up infrared light, and that’s what makes the difference. Splitting that light apart lets researchers determine how the gas is moving, rather than simply where it happens to be.
That weird S-shape wasn’t what it looked like
Close to the galaxy’s core sits a strange formation resembling the letter S. For a long stretch, that’s all anyone could say about it: a shape.
Then the data recast it. The apparent S revealed itself to be an enormous rotating disk of gas encircling the black hole. That disk spans close to 800 light-years. Some of the gas swirling within it is moving quickly too, reaching velocities as high as 600 kilometers per second.
Following the food to its last stop
This is where the astronomers’ interest really sharpened. The disk seems to link up directly with an enormous filament of colder gas.
Matter flows down that filament and settles into the rotating disk, gathering there before it ultimately feeds the black hole. Put simply, the team followed the meal’s route right through to its final destination.
Knowing that black holes bulk up by drawing in gas is one thing. Charting the exact pipeline that supplies a particular one — from cold filament to spinning disk to the point of no return — is another matter entirely.
The findings appeared in The Astrophysical Journal Letters.