Can simulations reproduce the observed temperature–mass relation for clusters of galaxies? |
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Authors: | Peter AThomas OrrarujeeMuanwong Scott TKay rew RLiddle |
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Institution: | Astronomy Centre, University of Sussex, Falmer, Brighton BN1 9QJ |
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Abstract: | It has become increasingly apparent that traditional hydrodynamical simulations of galaxy clusters are unable to reproduce the observed properties of galaxy clusters, in particular overpredicting the mass corresponding to a given cluster temperature. Such overestimation may lead to systematic errors in results using galaxy clusters as cosmological probes, such as constraints on the density perturbation normalization σ 8. In this paper we demonstrate that inclusion of additional gas physics, namely radiative cooling and a possible pre-heating of gas prior to cluster formation, is able to bring the temperature–mass relation in the innermost parts of clusters into good agreement with recent determinations by Allen, Schmidt & Fabian using Chandra data. |
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Keywords: | hydrodynamics methods: N-body simulations galaxies: clusters: general X-rays: galaxies: clusters |
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