The James Webb Space Telescope has successfully identified the galaxy responsible for the most distant fast radio burst ever recorded, offering new clues about the origins of these cosmic phenomena. The discovery follows a 2024 detection by the MeerKAT radio telescope array in South Africa, which observed an ultra-fast radio wave packet emitting energy equivalent to three days of solar output in a fraction of a second.
By utilizing Webb’s near-infrared instruments, astronomers pinpointed a distant galaxy at the burst’s location. Analysis of the light’s redshift indicates the event occurred approximately 3 billion years after the Big Bang, during an epoch when star formation was reaching its peak. Surprisingly, the host galaxy is roughly 1,000 times smaller than typical galaxies associated with previous fast radio burst detections, which usually occur in massive star-forming regions billions of years later in cosmic history.
These findings challenge existing theories regarding how fast radio bursts are generated. One prominent hypothesis attributes them to the collision of two neutron stars, a process requiring billions of years and thus limited to older galaxies. An alternative theory proposes that they result from supernovae of massive stars, which can produce magnetars—neutron stars with extraordinarily powerful magnetic fields—more rapidly.
“Our work suggests that it’s very unlikely that this fast radio burst was produced by a merger,” stated Manisha Caleb, lead author of the study published in the journal Science and affiliated with the University of Sydney. The evidence points toward a supernova origin, lending further support to the theory that these bursts can emerge from specific types of stellar explosions in younger galaxies.
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