G.A. Mamon, F. Combes, C. Deffayet and B. Fort (eds)
EAS Publications Series, 20 (2006) 297-298
X-ray properties of present-day galaxy systems from an inside-out growth model in a preheating scenario
Departament d'Astronomia i
Meteorologia i CER d'Astrofísica, Partícules i Cosmologia, Universitat de Barcelona, Spain
2 Departament de Matemàtica Aplicada II, Universitat Politècnica de Catalunya, Spain
We have developed an analytic model for a preheated, polytropic IGM in hydrostatic equilibrium within a NFW potential in which the evolution of the halo structure between major merger events proceeds inside-out by accretion. For a polytropic index of 1.2, consistent with both many observational results and predictions from high-resolution gasdynamical simulations, our model is capable of reproducing faithfully all the observed X-ray properties of nearby relaxed, non-cooling flow groups and clusters of galaxies with a universal level of energy injection of about half a keV (see Solanes et al. 2005 for details).
© EAS, EDP Sciences, 2006