These are density maps of galaxy cluster distribution. Credit: Kavli IPMU
First observational evidence for assembly bias could impact understanding of the universe. An international team of researchers has shown that the relationship between galaxy clusters and their surrounding dark matter halo is more complex than previously thought. The researchers’ findings are the first to use observational data to show that, in addition to mass, a galaxy cluster’s formation history plays a role in how it interacts with its environment.
There is a connection between galaxy clusters and their dark matter halos that holds a great deal of information about the universe’s content of dark matter and accelerating expansion due to dark energy...
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