Exploring Different Neutralino Dark Matter Annihilation Channels in Radio Frequency Emission in Simulated Coma Like Galaxy Cluster
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Date
2020-02-02
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Addis Ababa University
Abstract
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_1026 cm3s1. We predict
radio emission from non-thermal scenario whenDMannihilates into different channels
such as b_ b, __+ and WW+. 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.
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Keywords
Exploring Different Neutralino, Dark Matter Annihilation Channels, Radio Frequency Emission, Simulated Coma, Like Galaxy Cluster