Group members: Silvano Molendi, Simona Ghizzardi, Fabio Gastaldello, Mariachiara Rossetti plus Sabrina De Grandi and Dominique Eckert
Cluster outer regions. We have a been working on this topic for quite some time, exploiting data from various X-ray satellites (ROSAT, Beppo-SAX and XMM-Newton) and very recently Planck. Our most important results may be summarized as follows:
Cool-core/Non Cool-Core Clusters. The CC/NCC dichotomy is another topic we have been working on for some time. Our most important results may be summarized as follows:
Cold Fronts. In systems lacking evidence of major mergers cold fronts have been found in core regions where the entropy gradient is sufficiently developed to allow their formation and prevent their break-up (Ghizzardi et al 2010). These cold fronts are believed to result from tidal effects (dubbed sloshing) associated to minor merger events. A detailed analysis of a the entropy and metal abundance in a long observation of the core of Abell496 is allowing us to trace the sloshing of the ICM in unprecedented detail (Ghizzardi et al. in prep). Recently we have found evidence that extreme sloshing might be responsible for the disruption of cool cores (Rosssetti et al. in prep).
NuSTAR. NuSTAR is an explorer class NASA mission launched on June 13th 2012. NuSTAR carries the fist experiment capable of focusing X-rays above 10 keV. The mission is expected to produce a significant improvement in our undersatanding of various classes of astrophysical sources. The italian partecipation includes use of the Malindi ground station, software developement at ASDC-ASI and scientific support to the mission through a number of INAF scientists, including Silvano Molendi, who co-chairs the Galaxy Cluster working group.