Speaker
Description
Radio Mini-Halos (MHs) are centrally located, diffuse synchrotron radio sources with typical radius of ∼50–500 kpc. They are generally found in massive, dynamically relaxed, cool-core galaxy clusters, surrounding the Brightest Cluster Galaxy. To date, ∼40 MHs (including candidates) are known, a number that is primarily limited by observational constraints. The MGCLS has significantly contributed to this field by discovering three new MHs and seven new candidates, potentially increasing the known number of MHs by approximately 30%. We present preliminary results for the cluster J0342.8−5338, where we performed the data reduction using 1GC and 2GC analyses in CARACAL. The resulting image has a RMS of 13 μJy beam⁻¹ in a 15" image, which was used to derive the MH radio properties. Giacintucci et al. (2019) performed a statistical analysis of the radio and X-ray properties of 23 mini-halos, and we have updated this sample to 32 mini-halos. We observed a significant decrease in the correlation between the MH radio power and their X-ray bolometric luminosity (from +0.53 to +0.1), contrary to expectations based on the hadronic interaction model between thermal and non-thermal cosmic rays. Further investigation and analysis are needed to confirm this result, as it is a preliminary finding.
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