Exploring Different Neutralino Dark Matter Annihilation Channels In Radio Frequency Emission In Simulated Coma Like Galaxy Cluster

We studied various dark matter(DM) annihilation channels in radio frequencyrnin order to explore the possibility to interpret the still unknown origin of radiornemission in coma like simulated galaxy clusters. We consider three different DMrnmodels with light (9 GeV), intermediate (60 GeV), and high (500 GeV) neutralinornmass with annihilation cross-section times velocity of 1:0_10À€€26 cm3sð€€€1. We predictrnradio emission from non-thermal scenario whenDMannihilates into different channelsrnsuch as b_ b, _ð€€€_+ and Wð€€€W+. The radio emission produced for the three channels inrna simulated galaxy cluster is based on the MUSIC-data set. The raw data containrnthe particle mass and coordinates, which are used to determine the density _i ofrnthe DM particle by using Smoothed Particle Hydrodynamics(SPH) kernel. Thisrnallows us to easily compute the square of the DM densities integrated in the lineof-rnsight, revil the observed radio halo morphology showing radio emission bothrnfrom the centeral regions of the cluster and substructures lying off-center. Thernradio emission maps and the square of DM density maps were found to be identicalrnproving the fact that higher emission originate from the densest structures. Thernintegrated radio spectrum declines as frequency increases because of the radiativernlifetime of the relativistic electrons. The possibility of interpreting the origin ofrnradio emission in galaxy clusters with DM annihilation scenario requires a lowrnneutralino mass.

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