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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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