This mysterious dark matter continues to puzzle scientists, who hypothesize it comprises yet-to-be-discovered subatomic particles.breaks new ground by leveraging a well-established technique involving galaxy clusters to pin down the universe's matter density. "The total number of these clusters—called 'cluster abundance'—is a sensitive indicator of the amount of matter in the universe," says co-author Gillian Wilson, Professor of Physics at UC Merced.
Anatoly Klypin from the University of Virginia also notes a challenge in this area. He points out that accurately determining the mass of a galaxy cluster is difficult, particularly because the majority of the matter is dark and, therefore, not detectable by telescopes.Mass-richness relation in each cluster as a proxy for its mass. Known as mass-richness relation , this method allowed them to extrapolate the total mass of the galaxy clusters under observation.
Tomoaki Ishiyama, a key contributor from Chiba University, stated that by employing MRR, they could juxtapose observational findings with numerical models. The results produced an optimal alignment, confirming that the universe is made up of 31% matter. These findings align with observations of the cosmic microwave background made by the Planck satellite.
What sets this study apart is its pioneering use of spectroscopy—a technique that separates radiation into different bands or colors—to precisely measure the distance to each cluster and identify the galaxies genuinely part of it. This eliminates background or foreground noise, enabling a higher level of accuracy than ever before.The team's success marks a paradigm shift, proving that the MRR technique is a formidable ally in our quest to understand the universe.
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