Is the radio emission in the Bullet cluster due to Dark Matter
  annihilation?
  We study the complex structure of the Bullet cluster radio halo to determine
the Dark Matter (DM) contribution to the emission observed in the different
subhalos corresponding to the DM and baryonic dominated regions. We use
different non-thermal models to study the different regions, and we compare our
results with the available observations in the radio, X-ray and gamma-ray
bands, and the Sunyaev-Zel'dovich (SZ) effect data. We find that the radio
emission coming from the main DM subhalo can be produced by secondary electrons
produced by DM annihilations. In this scenario there are however some open
issues, like the difficulty to explain the observed flux at 8.8 GHz, the high
value of the required annihilation cross section, and the lack of observed
emission coming from the minor DM subhalo. We also find that part of the radio
emission originated by DM annihilation could be associated with a slightly
extended radio source present near the main DM subhalo. Regarding the baryonic
subhalos, the radio measurements do not allow to discriminate between a primary
or secondary origin of the electrons, while the SZ effect data point towards a
primary origin for the non-thermal electrons in the Main Subcluster. We
conclude that in order to better constrain the properties of the DM subhalos,
it is important to perform detailed measurements of the radio emission in the
regions where the DM halos have their peaks, and that the separation of the
complex radio halo in different subhalos is a promising technique to understand
the properties of each specific subhalo.
