出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：Results of XMM-Newton survey of 40 galaxy groups are presented with accent on the global
properties of the gas, such as entropy and pressure. We conrm the modied entropy scaling
relation of Ponman, Sanderson & Finoguenov (2003) at central parts of the groups (0
1r500). At
the same time, we show distinct differences between the virialized groups and emission originated
from halos of early-type galaxies. The slopes of the entropy proles of the groups are on average
atter than 1.1 law, typical of the clusters. We present the results of numerical simulations using
the P-GADGET-II code, which are the rst simulations capable to reproduce these newly observed
trends.
