JWST reveals the missing link: how supermassive black holes are fed
For decades, astronomers have understood that supermassive black holes at the centers of galaxies are somehow fed by surrounding gas. But the actual mechanism — how gas travels from thousands of light-years away down to within a few hundred light-years of the black hole — has remained one of the most persistent missing pieces in galaxy evolution theory.
Now, a team of 38 astronomers led by Julie Hlavacek-Larrondo at the Universite de Montreal has used the James Webb Space Telescope to find the answer. Their paper, published on arXiv on June 4 and submitted to Astrophysical Journal Letters, presents the first JWST NIRSpec observations of NGC 4696, the central galaxy of the Centaurus cluster, at an unprecedented 10 parsec resolution.
The S-shaped swirl
NGC 4696 has long been known to host a spectacular multiphase nebula spanning six decades in temperature — from hot X-ray emitting plasma at 100 million Kelvin down to cold molecular gas. Previous Hubble Space Telescope H-alpha imaging revealed a striking S-shaped swirl of ionized gas within the black hole’s sphere of influence, the first such structure ever identified in a galaxy cluster core.
But Hubble could only see the surface. What lay beneath remained a mystery.
JWST’s NIRSpec instrument changed that. By probing the inner 618 by 618 parsecs at 10 parsec resolution, the team discovered that the S-shaped swirl is actually a rotating, multiphase circumnuclear disk (CND), physically and kinematically connected to the larger filamentary network that extends across tens of kiloparsecs.
This is the long-sought missing link.
How the filaments work
The picture that emerges from the data is a elegant cosmic plumbing system. In the hot atmosphere of the Centaurus cluster, gas begins to cool and condense into filaments. These multiphase filaments — containing gas at every temperature from hot plasma to cold molecular clouds — extend inward from cluster scales toward the galaxy center.
As the filaments approach the black hole’s sphere of influence, they lose angular momentum and spiral into the rotating circumnuclear disk. This disk then mediates the final stage of accretion onto the black hole itself.
“The observed morphology and kinematics are reproduced by tailored magnetohydrodynamic simulations,” the team reports. In these simulations, filamentary gas condenses from the hot atmosphere, loses angular momentum through interactions with the surrounding medium, and feeds a rotating CND that ultimately supplies the black hole.
A universal mechanism?
Remarkably, the same structure has now been identified in two prototypical systems: NGC 4696 in Centaurus and NGC 1275 in Perseus. Both are classic examples of “radio-mode” AGN feedback, where the black hole’s jets inflate X-ray cavities that regulate cooling and star formation in the surrounding gas.
That two of the most studied cluster cores both show the same filament-to-CND connection strongly suggests a common mechanism. Multiphase filaments transport gas from cluster scales down to the black hole’s vicinity via a circumnuclear disk, closing the AGN feedback loop.
“This establishes a physically grounded framework for self-regulated galaxy evolution,” the authors write.
Why it matters
The discovery fills a critical gap in our understanding of how galaxies and their central black holes co-evolve. Theoretical models have long predicted that black hole growth and galaxy star formation are linked through feedback cycles. But without knowing exactly how gas reaches the black hole, the models could never be fully tested.
Now, JWST has provided the observational evidence. The filaments are not just passive structures, they are the active conduits through which black holes are fed. And the circumnuclear disk is not a permanent feature, it is the intermediary that regulates how much gas reaches the black hole at any given time.
For the Centaurus cluster, this means that the black hole’s activity — which drives the jets that inflate X-ray cavities and prevent the intracluster medium from cooling too rapidly — is directly controlled by the rate at which filaments feed the CND. When the filaments supply more gas, the black hole feeds more aggressively, and its feedback heats the surrounding gas, reducing the supply. This creates a self-regulating cycle that has been hypothesized for decades but never directly observed.
The next steps
The team plans to expand the survey to other cluster cores to see how universal the filament-to-CND connection really is. Early indications from archival data suggest similar structures may be common, but only JWST has the resolution and sensitivity to confirm them.
With NIRSpec’s ability to map gas kinematics at 10 parsec scales, the era of directly observing black hole feeding has truly begun.
Reference: Hlavacek-Larrondo, J., Choi, H., Guo, M. et al. 2026. “JWST reveals how black holes are fed: kiloparsec-scale multiphase filaments feed sub-kiloparsec circumnuclear disks.” arXiv:2606.06620. Submitted to ApJ Letters.