'They Found the Missing Matter': Cosmic Radio Bursts Used to Map Long-Lost Atoms Hiding Across the Universe for Billions of Years
to trace missing ordinary matter in the universe. 🔭 The study confirmed that approximately 76% of ordinary matter is dispersed in the intergalactic medium .
. 🌌 Localization of FRBs is crucial for accurately mapping the matter they encounter across billions of light-years.
is crucial for accurately mapping the matter they encounter across billions of light-years. 🔬 The findings could unlock new insights into neutrino mass and challenge existing physics models.
The universe has long been a source of fascination and mystery for scientists and enthusiasts alike. Among its many enigmas was the elusive nature of ordinary matter, which forms the very fabric of stars, planets, and life itself. For decades, nearly half of this ordinary matter seemed to be missing, hidden away in the vast expanses of space. However, recent breakthroughs have finally shed light on this cosmic puzzle, thanks to the discovery and analysis of fast radio bursts (FRBs). These fleeting yet powerful radio waves have become the key to mapping the universe's missing matter. Understanding Fast Radio Bursts
Fast Radio Bursts are brief, intense flashes of radio waves that originate from distant galaxies. Lasting only a few milliseconds, these cosmic signals are powerful enough to travel across billions of light-years. As they journey through the universe, they pass through clouds of ionized gas, slowing down slightly based on the amount of matter encountered. This process, known as dispersion, allows scientists to calculate the mass of invisible matter along the FRB's path.
In a groundbreaking study, astronomers from Caltech and the Center for Astrophysics | Harvard & Smithsonian harnessed the power of 69 well-localized FRBs to reveal the distribution of ordinary matter across the universe. One of these FRBs, FRB 20230521B, hails from an astonishing 9.1 billion light-years away, making it the most distant FRB ever recorded. The study's findings confirm that about 76% of ordinary matter resides in the intergalactic medium, a diffuse stretch of space between galaxies.
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To accurately trace the origins of FRBs and map the ordinary matter they illuminate, localization is essential. Only about a hundred of the over a thousand detected FRBs have been successfully traced back to their host galaxies. This localization is crucial for determining the FRB's distance, which is necessary for mapping the matter it encountered.
Of the 69 FRBs analyzed in the study, 39 were discovered using the Deep Synoptic Array (DSA)-110, a sophisticated network of 110 radio antennas in California. The remaining FRBs were detected by global observatories such as Australia's Square Kilometre Array Pathfinder. Instruments at Hawaii's W. M. Keck Observatory and the Palomar Observatory near San Diego played a pivotal role in determining the distance to each FRB's host galaxy. These collaborative efforts have painted a comprehensive picture of the universe's ordinary matter distribution.
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The study's revelations align with predictions from advanced cosmological simulations, offering the first observational confirmation of the universe's matter distribution. This breakthrough opens new avenues for exploring fundamental physics, such as the mass of neutrinos—subatomic particles once thought to be massless. Real-world observations now suggest that neutrinos do possess mass, challenging the standard model of particle physics.
According to Vikram Ravi, assistant professor of astronomy at Caltech, the role of FRBs in cosmology is just beginning. A new project, Caltech's DSA-2000 radio telescope, is poised to localize up to 10,000 FRBs annually, further expanding their potential to probe the universe's structure and offer insights into phenomena beyond current scientific understanding.
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The findings from this study, published in Nature Astronomy, mark a significant milestone in our understanding of the cosmos. They highlight the potential of FRBs as tools for exploring not only the distribution of ordinary matter but also the fundamental forces that shape our universe. This research was generously funded by the National Science Foundation, underscoring the importance of continued investment in scientific exploration.
The implications of this work extend beyond mapping the universe. By better understanding the role and distribution of ordinary matter, we gain insights into the universe's formation, evolution, and ultimate fate. This knowledge may also inform future explorations of dark matter and dark energy, two of the universe's most profound mysteries.
As we continue to unravel the secrets of the universe, the discovery of FRBs as a tool for mapping ordinary matter opens exciting possibilities. What other cosmic phenomena might we uncover, and how will these discoveries shape our understanding of the universe and our place within it?
Our author used artificial intelligence to enhance this article.
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