US EditionAstronomers Locate Universe's 'Missing' Matter
- On June 16, researchers from Caltech and the Harvard-Smithsonian Center for Astrophysics announced in Nature Astronomy that they located the universe’s missing ordinary matter by analyzing fast radio bursts .
- For decades, at least half of the universe’s baryonic matter was unaccounted for, prompting researchers to use FRBs to track down this elusive matter between galaxies.
- They analyzed 69 FRBs from sources up to 9.1 billion light-years away and measured how the light slowed passing through the intergalactic medium to locate about 76% of normal matter in this gas, 15% in galaxy halos, and 9% inside galaxies as stars or cold gas.
- CfA astronomer Liam Connor explained that fast radio bursts pass through the diffuse gas between galaxies, and by accurately tracking the slight delay in their signals, researchers can determine the amount of this otherwise invisible matter, supporting earlier theoretical predictions.
- This discovery solves the missing baryon problem and enables mapping of the cosmic web in more detail with upcoming telescopes like Caltech's DSA-2000, which will detect thousands of new FRBs annually.
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Mysterious deep-space radio signals reveal location of the universe's 'missing matter'
Much of the universe's regular "baryonic" matter is spread through intergalactic space and in diffuse halos around galaxies, researchers proposed after studying the behavior of fast radio bursts emitted from deep space.
·United States
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Astronomers have found the home address for the universe's 'missing' matter
A new landmark study has pinpointed the location of the universe's "missing" matter, and detected the most distant fast radio burst (FRB) on record. Using FRBs as a guide, astronomers at the Center for Astrophysics | Harvard & Smithsonian (CfA) and Caltech have shown that more than three-quarters of the universe's ordinary matter has been hiding in the thin gas between galaxies, marking a major step forward in understanding how matter interacts …
·United Kingdom
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