Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993adspr..13..181b&link_type=abstract
Advances in Space Research (ISSN 0273-1177), vol. 13, no. 12, p. (12)181-(12)190
Astronomy and Astrophysics
Astronomy
5
Astronomical Models, Cosmology, Galactic Clusters, High Temperature Plasmas, Interstellar Gas, Universe, X Ray Astronomy, Ginga Satellite, Heao 2, Mass Distribution, Nuclear Fusion, Proportional Counters, Rosat Mission, Temperature Distribution, X Ray Imagery, X Ray Telescopes
Scientific paper
Clusters of galaxies are filled with a hot teneous plasma which is emitting soft X-rays over very extended regions. The ROSAT observatory with its high resolution and high sensitivity X-ray telescope allows the imaging of nearby clusters in great detail and is therefore ideally suited to study the structure and morphology of galaxy clusters. In particular the distribution of the intracluster gas can be mapped, some information on the temperature structure of the gas can be obtained, the gravitational mass can be infered, and the dynamical state of the clusters can be investigated. Results of such studies for some nearby clusters (Virgo, Perseus and Coma) are presented. Gas mass fractions of the total gravitational mass of the cluster in excess of 10 to 15% are infered from X-ray observations where the cluster emission can be traced out to an Abell radius (3 Mpc). If these values are taken to be representative for the matter composition in the Universe, it has interesting consequences for cosmology, as for example, for the nucleosythesis models and the mean density of the Universe.
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