The most powerful particles in the universe are being blasted toward Earth by a specific radio galaxy named Fornax A.
April 29, 2026
Original Paper
UHECR doublets and their conditional association with nearby radio galaxies
arXiv · 2604.23103
The Takeaway
Ultra-high-energy cosmic rays are the fastest-moving pieces of matter ever observed, but their origin has been a mystery for over 50 years. Researchers have identified 28 clusters of these particles and linked them to nearby radio galaxies with high statistical certainty. These galaxies act like giant natural particle accelerators, launching matter across space with more energy than any machine on Earth could ever produce. Pinpointing these sources allows astronomers to finally study the extreme physics happening at the hearts of active galaxies. This discovery is a massive step toward solving one of the longest-running puzzles in high-energy astrophysics.
From the abstract
The origin of ultra-high-energy cosmic rays (UHECRs) remains a fundamental question in astroparticle physics. While localized 3 $\sigma$ correlations with active galactic nuclei and starburst galaxies have been reported using time-integrated analyses, we propose and implement a spatiotemporal multiplet search method utilizing a pre-defined fixed window of 3 degrees and 15 days, a kinematic filter designed to isolate high-rigidity particles and keep chance coincidences low. Applying this method t