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

Peter A.Thomas  OrrarujeeMuanwong  Scott T.Kay  rew R.Liddle 《Monthly notices of the Royal Astronomical Society》2002,330(2):L48-L52

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.  相似文献