"Discovery: European Astronomers Uncover Radio Halo's New Element in Nearby Galaxy Cluster"
European astronomers using the LOFAR telescope have discovered a new component, named H3, in the radio halo of the nearby galaxy cluster Abell 2142. The radio halo is a diffuse region of radio emission found at the center of galaxy clusters. The discovery of H3 provides further insights into the structure of the halo and its relationship with the X-ray thermal distribution of the intracluster medium. The researchers propose two hypotheses for the origin of H3, suggesting it may be the result of an old energetic merger or turbulent re-acceleration induced by ongoing minor mergers.