Statistical investigation of the non-thermal emission of galaxy clusters

Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics

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4 pages, 3 figures. Proceedings for the "45th Rencontres de Moriond", La Thuile (Val d'Aosta, Italy), March 13-20, 2010

Scientific paper

A diffuse non-thermal component has now been observed in massive merging clusters. To better characterise this component, and to extend analyses done for massive clusters down to a lower mass regime, we are conducting a statistical analysis over a large number of X-ray clusters (from ROSAT based catalogues). By means of their stacked radio and X-ray emissions, we are investigating correlations between the non-thermal and the thermal baryonic components. We will present preliminary results on radio-X scaling relations with which we aim to probe the mechanisms that power diffuse radio emission ; to better constrain whether the non-thermal cluster properties are compatible with a hierarchical framework of structure formation ; and to quantify the non-thermal pressure.

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