Other
Scientific paper
May 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...292..441h&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 292, May 15, 1985, p. 441-446.
Other
43
Astronomical Models, Galactic Clusters, Intergalactic Media, Isothermal Processes, X Ray Sources, Brightness Distribution, Cosmic Gases, Heao, Mass Distribution
Scientific paper
HEAO-1 A-2 and Einstein Observatory IPC observations of 15 clusters of galaxies have been used to measure the isothermal beta-model parameters, and the parameters are compared with those derived from model fits to the X-ray images. The physical constraints imposed on this model by existing optical data, the implied gas mass, and the gas contribution to the binding cluster mass are addressed. Values of beta less than unity are obtained, consistent with results from X-ray imaging data. This is interpreted to imply that the gas extends out to 8-10 core radii, about 2-3 Mpc. The isothermal gas mass can be as large as 60 percent of the virial mass for some clusters. This contradicts the fundamental assumption that the cluster potential is determined by an unseen mass which is given by the King approximation to an isothermal sphere, and it is concluded that the isothermal model is a nonphysical model.
Henriksen Mark J.
Mushotzky Richard F.
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