Particle accelerators, such as the Large Hadron Collider (LHC) at CERN, are powerful machines designed to accelerate charged particles to high energies and smash them together to study the fundamental building blocks of matter. These man-made accelerators have revolutionized our understanding of particle physics, but their existence in nature has remained a mystery.
Using data from the Telescope Array Surface Detector in Utah, an international team of researchers led by the University of Tokyo detected a high-energy cosmic ray with an energy 100 million times greater than the energy of protons accelerated by the LHC. This ultra-high-energy cosmic ray, dubbed the "Oh-My-God" particle when it was first observed in 1991, is believed to have originated in a distant galaxy.
Further analysis of data recorded by the Telescope Array revealed that the path of the "Oh-My-God" particle was aligned with a narrow jet of radio emission from a supermassive black hole located about 1 billion light-years away in the constellation of Boötes. This alignment suggests that the ultra-high-energy particle may have been accelerated by the jets of the supermassive black hole, acting like a natural particle accelerator.
The findings, published in the journal Physical Review Letters, provide compelling evidence for the existence of naturally occurring particle accelerators in the universe. These accelerators could play a crucial role in the production of high-energy cosmic rays, which are subatomic particles that rain down on Earth from space with energies far beyond what can be achieved by human-made accelerators.
Studying these natural accelerators and the cosmic rays they produce could shed light on the extreme environments and energetic processes that occur near supermassive black holes and other cosmic phenomena, offering valuable insights into the early universe and the origin of high-energy particles.
The detection of a potential natural particle accelerator also opens up exciting avenues for future research in astroparticle physics. It highlights the importance of ground-based observatories, such as the Telescope Array, in exploring the universe's highest energy phenomena and understanding the fundamental laws that govern the cosmos.
