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Oldest quick radio burst ever seen sheds mild on early star formation

August 15, 2025
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Oldest quick radio burst ever seen sheds mild on early star formation
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Magnetars, that are a form of neutron star, could be the supply of quick radio bursts

Science Photograph Library/Alamy

A wierd flash of sunshine from close to the start of the universe might assist astronomers map difficult-to-see gasoline in between galaxies, like a flashbulb in a darkish room.

Quick radio bursts (FRBs) are extraordinarily quick however highly effective blasts of radio-frequency mild which have puzzled astronomers since they had been first noticed in 2007. A number one idea is that they’re produced by extraordinarily magnetic neutron stars, known as magnetars. However as a result of we solely know of some thousand examples in the entire universe, with most coming from galaxies which might be comparatively near the Milky Means, there’s a lot we nonetheless don’t perceive about them.

Now, Manisha Caleb on the College of Sydney, Australia, and her colleagues have noticed a particularly distant FRB that originated from a galaxy that existed simply 3 billion years after the beginning of the universe, which is billions of years older than the earlier document holder.

Caleb and her crew first noticed the burst, known as 20240304B, utilizing the MeerKAT radio telescope in South Africa in March 2024 and adopted up the supply with observations from the James Webb House Telescope. They discovered the flash got here from a small, faint galaxy that seemed to be comparatively younger on the time the FRB was emitted and had shaped its stars shortly.

“That is fantastically distant,” says Jason Hessels on the College of Amsterdam within the Netherlands. FRB 20240304B comes from a time within the universe known as cosmic midday, when the speed of recent stars forming was at its peak. This, together with the galaxy’s younger age at the moment, may recommend that this FRB, and at the very least some others, come from younger stars that had solely simply exploded in supernovae and collapsed into magnetars, says Hessels.

One motive why astronomers are focused on FRBs is that the universe is filled with ionised gasoline, which has misplaced its electrons as a result of radiation produced by stars. This gasoline makes up the overwhelming majority of all matter within the universe, and understanding its distribution is vital for understanding how bigger objects, like stars and galaxies, shaped. However it’s troublesome to see except there’s a supply of sunshine passing by it, like an FRB.

“This vivid flash is illuminating all the ionised materials between us and the place the flash originated, so you need to use that to map the gasoline, and magnetic fields, which might be between stars and galaxies,” says Hessels.

As a result of FRB 20240304B was energetic throughout a time within the universe’s historical past when the primary stars had been forming and ionising the gasoline round them, we are able to use it to construct a timeline of when these stars first switched on, says Anastasia Fialkov on the College of Cambridge. And this may solely enhance if we discover much more distant FRBs.

New Scientist. Science news and long reads from expert journalists, covering developments in science, technology, health and the environment on the website and the magazine.

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