Measurements of the gas temperature and iron abundance distribution in the Coma Cluster

Details Measurements of the gas temperature and iron abundance distribution in the Coma Cluster Measurements of the gas temperature and iron abundance distribution in the Coma Cluster

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...329...82h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 329, June 1, 1988, p. 82-96. Research supported by the Smithsonian Institut

Mathematics

Logic

78

Abundance, Coma, Density Distribution, Gas Temperature, Intergalactic Media, Iron, Galactic Clusters, Morphology, X Ray Sources

Scientific paper

The medium energy X-ray detectors onboard the EXOSAT Observatory have been used to determine the gas temperature at several positions in the Coma Cluster of galaxies. Evidence is found at greater than 95 percent confidence for a higher temperature in the center of the cluster than in a position approximately 45 arcmin off-center. No difference in iron abundance is observed between the center and off-center regions and the equilibrium model for the distribution of elements in the Coma Cluster of Abramopoulos, Chanan, and Ku can be rejected with greater than 99.5 percent confidence, in favor of a model with more uniform composition. A phenomenological model is presented of the Coma Cluster, which is consistent with the data presented here, as well as the imaging data from the Einstein Observatory and the Tenma X-ray spectrum. The model has a central isothermal region of temperature about 9 keV extending to about 25 arcmin (about 1 Mpc). Beyond this radius the temperature falls as a polytrope with index about 1.6.

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