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2000MNRAS.315..689L - Mon. Not. R. Astron. Soc., 315, 689-702 (2000/July-2)
The entropy and energy of intergalactic gas in galaxy clusters.
LLOYD-DAVIES E.J., PONMAN T.J. and CANNON D.B.
Abstract (from CDS):
We determine the energy associated with this entropy floor, by studying the net reduction in binding energy of the gas in low-mass systems, and find that it corresponds to a pre-heating temperature of ∼0.3keV. Since the relationship between entropy and energy injection depends upon gas density, we are able to combine the excesses of 70-140keV.cm2 and 0.3keV to derive the typical electron density of the gas into which the energy was injected. The resulting value of {formmu2} implies that the heating must have happened prior to cluster collapse but after a redshift z∼7-10. The energy requirement is well matched to the energy from supernova explosions responsible for the metals which now pollute the intracluster gas.
Abstract Copyright: Blackwell Science Ltd
Journal keyword(s): galaxies: clusters: general - intergalactic medium - X-rays: general
Simbad objects: 22
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