Mysterious Gamma-Ray Glow Near Milky Way's Core May Be First Hint of Dark Matter

A mysterious gamma-ray glow at the center of the Milky Way — puzzling scientists for decades—may finally offer the first observational evidence of dark matter. The finding, based on a combination of supercomputer simulations and space telescope data, brings new hope in unraveling one of the universe's greatest mysteries.

Dark matter is thought to make up most of the universe's total mass and plays a vital role in holding galaxies together. Yet because it neither emits nor interacts with light, detecting it directly has proven extremely difficult. The Milky Way's central gamma-ray excess has long been attributed to two competing explanations: collisions and annihilation of dark matter particles, or emissions from a vast population of millisecond pulsars.

A new study published in Physical Review Letters marks a key step forward. Led by researchers from the Leibniz Institute for Astrophysics Potsdam in Germany, the team used a supercomputer to create the first model of dark matter distribution that incorporates the Milky Way's formation history. The simulation suggests that in the galaxy's dense core, frequent dark matter collisions could produce gamma rays with a pattern strikingly similar to what NASA's Fermi Gamma-ray Space Telescope has actually observed.

Still, scientists are cautious. The pulsar hypothesis could also account for some observed features—but it would require far more pulsars than have ever been detected, leaving the idea open to challenge.

The upcoming Cherenkov Telescope Array Observatory (CTAO), now under construction, could provide decisive evidence. With unprecedented sensitivity and resolution, CTAO will be able to distinguish the energy signatures of gamma rays, helping determine whether the mysterious glow arises from dark matter interactions or pulsar emissions.

Meanwhile, the research team is applying the same dark matter model to dwarf galaxies orbiting the Milky Way. By comparing predictions with future high-resolution observations, scientists hope to further test the dark matter hypothesis. Whatever the outcome, this pursuit is bringing humanity closer to understanding the true structure of galaxies—and the hidden nature of our universe.