Speaker
Description
We present an investigation of the properties of radio relics (RRs), one type of diffuse emission located at the outskirts of some Galaxy Clusters (GCs), and a search for information about the origin of non-thermal processes taking place in the cluster atmospheres. We adopt a new approach to constrain models for the origin of RRs according to the following steps: i) Instead of working on a single relic, we worked on a large sample of RRs, by performing the compilation of one of the largest reference cluster relic sample (77 relics) available; ii) We perform a study of statistical properties of RRs and the hosting clusters by evaluating the relationship between the radio power of relics at 1.4 GHz and: radio halos power, cluster X-rays bolometric luminosity, integrated Compton parameter, cooling time, and Mach number of the shock associated to the relic; iii) We perform morphological analysis of the connection between RRs and the population of fossil particles coming from radio galaxies jets and lobes in the cluster. The results obtained show that relics know about halos because they scale together in their radio powers, galaxy activity in the cluster centre, and cluster properties like X-ray luminosity and Integrated Compton parameter. Examination of relics in other clusters, as well as optical/infrared spectroscopic studies of candidate radio galaxies as possible origins of the relics, and deep radio studies of their jets and lobes, will be necessary to derive solid results.
