1112.3179 (A. Lapi et al.)

The Intracluster Plasma: a Universal Pressure Profile?    [PDF]

A. Lapi, A. Cavaliere, R. Fusco-Femiano

The pressure profiles of the Intracluster Plasma in galaxy clusters show a wide variance when observed in X rays at low redshifts z<0.2. We find the profiles to follow two main patterns, featuring either a steep or a shallow shape throughout both core and outskirts. We trace these shapes back to a physical dichotomy of clusters into two classes, marked by either low entropy (LE) or high entropy (HE) throughout. From X-ray observations and Sunyaev-Zel'dovich stacked data at higher 0.20.5. We submit our physical templates and converging trend for further observational tests, in view of the current and upcoming measurements of individual, stacked, and integrated Sunyaev-Zel'dovich signals.

View original: http://arxiv.org/abs/1112.3179