Milky Way’s Central Rotating Black Hole Confirmed as a Powerful Galactic PeVatron

Recent high‑energy measurements have bolstered the argument that the supermassive black hole at the Milky Way’s center operates as a galactic PeVatron, capable of accelerating particles to peta‑electron‑volt energies and even emitting neutrons that travel outward from the core.

Astrophysicists often compare active black holes to cellular mitochondria, turning matter into enormous energy. Most of that power originates not from the black hole itself but from the hot plasma swirling in its accretion disk, where friction and intense magnetic fields heat the gas to extreme temperatures.

Around a rotating, or Kerr, black hole the magnetic field lines become tangled and can drive jets that pierce the surrounding medium. Inside these jets, particles undergo repeated scattering and acceleration, a mechanism that can lift protons and heavier nuclei to energies beyond one quadrillion electron‑volts. When such ultra‑relativistic nuclei collide with ambient gas or radiation, they generate secondary particles, including neutral neutrons that break free of magnetic confinement.

The latest detections of very‑high‑energy gamma rays from the Galactic Center, together with a faint neutron flux inferred from air‑shower arrays, point to a source capable of sustaining PeV‑scale acceleration. The gamma‑ray emission’s spatial pattern matches the location of the central black hole, Sagittarius A*, making its rotating engine the most plausible accelerator.

These results carry wide‑reaching implications for the long‑standing puzzle of the origin of the highest‑energy cosmic rays that strike Earth. Should the Milky Way’s nucleus function as a PeVatron, it could supply a substantial portion of the Galactic cosmic‑ray budget, complementing other proposed sites such as supernova remnants and pulsar wind nebulae.

Upcoming instruments, like the Cherenkov Telescope Array and next‑generation neutrino detectors, will probe this hypothesis by mapping the energy spectrum and spatial morphology of the emission with greater precision. Verifying a neutron‑producing PeVatron at the Galaxy’s core would solidify rotating black holes as major engines in high‑energy astrophysics, linking extreme gravity dynamics to the particle environment throughout the Milky Way.