Browsing by Author "Regasa, Jemal"

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    Exploring Different Neutralino Dark Matter Annihilation Channels in Radio Frequency Emission in Simulated Coma Like Galaxy Cluster
    (Addis Ababa University, 2020-02-02) Regasa, Jemal; Reshid, Remudin (PhD)
    We studied various dark matter(DM) annihilation channels in radio frequency in order to explore the possibility to interpret the still unknown origin of radio emission in coma like simulated galaxy clusters. We consider three different DM models with light (9 GeV), intermediate (60 GeV), and high (500 GeV) neutralino mass with annihilation cross-section times velocity of 1:0_10􀀀26 cm3s􀀀1. We predict radio emission from non-thermal scenario whenDMannihilates into different channels such as b_ b, _􀀀_+ and W􀀀W+. The radio emission produced for the three channels in a simulated galaxy cluster is based on the MUSIC-data set. The raw data contain the particle mass and coordinates, which are used to determine the density _i of the DM particle by using Smoothed Particle Hydrodynamics(SPH) kernel. This allows us to easily compute the square of the DM densities integrated in the lineof- sight, revil the observed radio halo morphology showing radio emission both from the centeral regions of the cluster and substructures lying off-center. The radio emission maps and the square of DM density maps were found to be identical proving the fact that higher emission originate from the densest structures. The integrated radio spectrum declines as frequency increases because of the radiative lifetime of the relativistic electrons. The possibility of interpreting the origin of radio emission in galaxy clusters with DM annihilation scenario requires a low neutralino mass.