Speaker
Description
Dark matter annihilation is a possible source of relativistic electrons in galaxy clusters; these electrons, when interacting with the cluster magnetic field, can produce a diffuse synchrotron emission with properties similar to those of radio halos.
In principle, if dark matter annihilation is the main source of electrons producing the radio halos, from the halos properties it would be possible to derive constraints on the properties of dark matter. However, in galaxy clusters other processes can provide relativistic electrons, and the dark matter originated electrons themselves can be reaccelerated on diffuse scale by processes related to the cluster turbulence, making it difficult to derive constraints on dark matter from observations of radio halos.
In this talk, we discuss how high frequency observations of radio halos can be useful to derive better constraints on the dark matter properties, at the light of recent observations of the halo in the Coma cluster with SRT, and of the expected properties of the SKAO in AA* and AA4 configurations for more distant clusters.
| Topics | Galaxy Clusters & LSS (relativistic particles and magnetic fields) |
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