TEMPERATURE AND ENTROPY PROFILES OF NEARBY COOLING FLOW CLUSTERS OBSERVED WITH XMM-NEWTON AND THE EFFERVESCENT HEATING MODEL

摘要

We present temperature and entropy profiles of 13 nearby cooling flow clusters observed with XMM-Newton. When normalized and scaled by the virial radius the temperature profiles turn out to be remarkably similar and at large radii the temperature profiles show a clear decline. The entropy S of the plasma increases monotonically moving outwards almost proportional to the radius. The dispersion in the entropy profiles is smaller if the empirical relation S ∝ T{sup}0.65 is used instead of the standard self-similar relation S ∝ T and no entropy cores are observed. In addition to these results we present recent observational constraints on the "effervescent heating" model derived from XMM-Newton observations of 16 cooling flow clusters.