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Researchers Poised to Decode Cosmic Dawn's 21-Centimeter Signal
- On June 20, 2025, researchers led by Professor Anastasia Fialkov of Cambridge published a study in Nature Astronomy on the 21-centimeter radio signal.
- The study investigates how the universe's earliest stars, which emerged roughly 100 million years following the Big Bang, affected the radio signal produced by neutral hydrogen atoms.
- The researchers developed a new model including ultraviolet and X-ray emissions from early stars and their remnants, improving on prior underestimated connections.
- Fialkov emphasized that their team is pioneering in systematically analyzing how the 21-centimeter signal varies with the mass of the earliest stars, underscoring the innovative nature of their research.
- Their findings enable statistical analysis from REACH and the upcoming Square Kilometre Array to explore early star populations, guiding radio observations in South Africa.
11 Articles
11 Articles
What the Universe tried to hide: The 21-centimeter signal explained
Scientists are peering into the universe's mysterious Cosmic Dawn using the faint whispers of hydrogen radio waves emitted over 13 billion years ago. These signals, particularly the elusive 21-centimeter signal, offer rare insights into the masses and behavior of the universe’s first stars—Population III stars—whose light we can’t see directly. With projects like REACH and the upcoming Square Kilometre Array (SKA), researchers are unlocking a co…
Eurek Alert
University of CambridgeCosmic signal from the very early universe will help astronomers detect the first stars
An international group of astronomers led by the University of Cambridge have shown that we will be able to learn about the masses of the earliest stars by studying a specific radio signal – created by hydrogen atoms filling the gaps between star-forming regions – originating just a hundred million years after the Big Bang.
At the beginning: only dark. It was only when the very first stars came to a close that the universe began to shine. But to this day, it is unclear how these original stars came from. Their radiation was the first major upheaval in the development of space. Now they have been captured. (Read more)
Researchers discover clues to the first stars in space – and thus encounter star systems, which were apparently brighter and more frequent than science has previously assumed. read more on t3n.de
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