Mathematics – Logic
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21311201a&link_type=abstract
American Astronomical Society, AAS Meeting #213, #112.01; Bulletin of the American Astronomical Society, Vol. 41, p.504
Mathematics
Logic
Scientific paper
Galaxy clusters are the most massive bound objects in the Universe. X-ray observations of these systems provide insights into the physics of cosmic plasmas and powerful constraints on cosmology. Collisions and mergers between galaxy clusters are the most energetic events since the Big Bang. These events generate observable shocks and cold fronts in the plasma that fills the clusters. Such collisions can also temporarily separate dark from ordinary matter, allowing a clearer view of the nature of dark matter. Clusters, being the largest objects known, are expected to contain an approximately representative sample of the matter of the universe. Constraints on dark matter and dark energy can be obtained by comparing the apparent baryonic matter content of clusters as a function of redshift with the universal value. Because the formation of clusters is still ongoing, their observed number density is also exquisitely sensitive to cosmological parameters. Cosmological constraints deduced from clusters are complementary to those coming from other methods, providing a detailed test of the concordance cosmological model. We will discuss all of these issues in this talk.
Allen Steven W.
Henry Patrick J.
Markevitch Maxim L.
Vikhlinin Alexey M.
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