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8th of February 2022
Radio footprints of a minor merger in the Shapley Supercluster
by Venturi et al.
The Shapley Supercluster is one of the richest and most massive concentrations of gravitationally bound galaxy clusters in the local Universe. It is located in the southern sky and lies behind the Hydra-Centaurus cluster. Overall, the structure covers a redshift range from 0.033 to 0.06. Due to the very high overdensity and large number of galaxy clusters, and its relative proximity, it is an ideal place to start investigating the effects of group accretion and cluster minor mergers. Venturi et al. have used ASKAP, the GMRT and MeerKAT radio telescopes to investigate the less energetic events of mass assembly in the Shapley Supercluster from supercluster down to galactic scales. They performed a detailed morphological and spectral study of the extended emission features, complemented with ESO-VST optical imaging and X–ray data from XMM-Newton. They report the first GHz frequency detection of extremely low brightness intercluster diffuse emission on a ∼ 1 Mpc scale connecting the Abell 3562 cluster and the galaxy group SC 1329–313, which is morphologically similar to the X-ray emission in the region. Their study strongly supports the scenario of a flyby of SC 1329–313 north of A 3562 into the supercluster core. This event perturbed the centre of A 3562, leaving traces of this interaction in the form of turbulence between A 3562 and SC 1329–313. The figure above shows the location of the clusters and groups in the Shapley Supercluster. The redshift range considered is 0.035–0.060. The cyan lines highlight the area covered by the ASKAP observations, the red lines highlight the coverage of the ESO-VST optical imaging. The paper will be published in Astronomy & Astrophysics.

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