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

Recent high‑energy measurements reinforce the idea that the Milky Way’s central supermassive black hole acts as a galactic PeVatron, boosting particles to peta‑electron‑volt levels and emitting neutrons that stream away from the core.

Scientists frequently compare active black holes to cellular mitochondria, turning infalling matter into enormous energy. Most of this output originates not from the black hole itself but from the rotating plasma of its accretion disk, where friction and strong magnetic fields raise the gas to scorching temperatures.

Near a rotating, i.e., Kerr, black hole, magnetic field lines get wound up and can drive jets that cut through the surrounding environment. Inside those jets, particles undergo repeated scattering and acceleration, capable of lifting protons and heavier nuclei beyond one quadrillion electron‑volts. Upon colliding with surrounding gas or radiation, these ultra‑relativistic nuclei generate secondary particles, among them neutral neutrons that break free from magnetic confinement.

New observations of very‑high‑energy gamma rays coming from the Galactic Center, coupled with a subtle neutron flux deduced from air‑shower detectors, indicate a source able to maintain PeV‑scale acceleration. The pattern of the gamma‑ray emission coincides with the location of Sagittarius A*, the central black hole, implying that its rotating engine is the most likely accelerator.

The results bear wide‑reaching consequences for the enduring puzzle of where the most energetic cosmic rays striking Earth originate. Should the Milky Way’s core function as a PeVatron, it could supply a sizable portion of the Galaxy’s cosmic‑ray inventory, alongside other proposed sources like supernova remnants and pulsar wind nebulae.

Upcoming instruments such as the Cherenkov Telescope Array and next‑generation neutrino detectors will probe this hypothesis by charting the emission’s energy spectrum and spatial shape with greater precision. Verifying a neutron‑emitting PeVatron at the Galaxy’s center would solidify rotating black holes as principal engines in high‑energy astrophysics, tying extreme gravity dynamics to the particle milieu across the Milky Way.