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A520 is a hot and luminous galaxy cluster, where gravitational lensing andX-ray measures reveal a different spatial distribution of baryonic and DarkMatter. This cluster hosts a radio halo, whose map shows a separation betweenthe North-East and the South-West part of the cluster, similarly to what isobserved in gravitational lensing maps. In this paper we study the possibilitythat the diffuse radio emission in this cluster is produced by Dark Matterannihilation. We find that in the whole cluster the radio emission should bedominated by baryonic phenomena; if a contribution from Dark Matter is present,it should be searched in a region in the NE part of the cluster, where a peakof the radio emission is located close to a Dark Matter sub-halo, in a regionwhere the X-ray emission is not very strong. By estimating the radio spectrumintegrated in this region using data from publicly available surveys, we findthat this spectrum can be reproduced by a Dark Matter model for a neutralinowith mass 43 GeV and annihilation final state $b \bar b$ for a magnetic fieldof 5 $\mu$G.

The role of Dark Matter annihilation in the radio emission of the galaxy cluster A520