Mathematics – Logic
Scientific paper
Nov 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..dppri2003s&link_type=abstract
American Physical Society, 44th Annual Meeting of the Division of Plasma , abstract #RI2.003
Mathematics
Logic
Scientific paper
Clusters of galaxies are the largest relaxed structures in the Universe. They are important cosmological probes, since they are large enough to contain a fair sample of the materials in the Universe, but small enough to have achieved dynamical equilibrium. Clusters were first discovered as concentrations of hundreds of galaxies in a region about 3 megaparsecs (10 million light years) across. However, the dominant observed form of matter in clusters is hot, diffuse intergalactic gas. This intracluster plasma has typical temperatures of T 10^8 K, and typical electron densities of ne 10-3 cm-3. This intracluster plasma mainly emits X-rays, and typical cluster X-ray luminosities are LX 10^43 - 10^45 erg/s. The basic properties of and physical processes in the intracluster plasma will be reviewed. Important observational constraints on plasma processes in these systems will be discussed. I will also describe the results of recent X-ray observations of clusters of galaxies with the orbiting Chandra X-ray Observatory.
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