Can simulations reproduce the observed temperature-mass relation for clusters of galaxies?

Details Can simulations reproduce the observed temperature-mass relation for clusters of galaxies? Can simulations reproduce the observed temperature-mass relation for clusters of galaxies?

2001-12-19

arxiv.org/abs/astro-ph/0112449v1

Mon.Not.Roy.Astron.Soc. 330 (2002) L48

Astronomy and Astrophysics

Astrophysics

5 pages, submitted to MNRAS

Scientific paper

10.1046/j.1365-8711.2002.05307.x

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 sigma_8. In this paper we demonstrate that inclusion of additional gas physics, namely radiative cooling and a possible preheating 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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