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Title:
Parameters and predictions for the X-ray emitting gas of Coma, Perseus, and Virgo
Authors:
Bahcall, J. N.; Sarazin, C. L.
Affiliation:
AA(Institute for Advanced Study, Princeton, N.J.), AB(Institute for Advanced Study, Princeton, N.J.)
Publication:
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 213, May 1, 1977, p. L99-L103. (ApJ Homepage)
Publication Date:
05/1977
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
ASTRONOMICAL MODELS, GALACTIC CLUSTERS, INTERSTELLAR GAS, VIRGO GALACTIC CLUSTER, X RAY SOURCES, ABUNDANCE, LUMINOUS INTENSITY, MICROWAVE EMISSION, SIZE DETERMINATION, STAR CLUSTERS, X RAY SPECTRA
Comment:
A&AA ID. AAA019.161.003
DOI:
10.1086/182418
Bibliographic Code:
1977ApJ...213L..99B

Abstract

The range of acceptable models for the intracluster gas in the Coma, Perseus, and Virgo clusters is determined from previous observations of the spectrum, intensity, and size of the cluster X-ray sources. Standard hydrostatic, wind, and inflow models are considered. For Virgo, a 'well' model is proposed in which the gas is trapped in the gravitational potential of M87, assumed to be very massive and extended. The iron abundance in the intracluster gas is determined from the observed strength of the 7-keV line feature; the required abundances for all models and all clusters are approximately equal and solar in value. The similarity of the abundances derived for these three clusters suggests that the line emission probably arises from the intracluster gas. Predictions are given for the cosmic microwave diminution and the dependence of X-ray size on observed energy for acceptable models for the intracluster gas.

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