Annihilating Dark Matter Search with 12 Years of Fermi LAT Data in
  Nearby Galaxy Clusters
  Galaxy clusters are the largest virialised objects in the Universe, and as
such, have a high dark matter (DM) concentration. This abundance of dark matter
makes them promising targets for indirect DM searches. Here we report the
details of a search, utilising almost 12~years of Fermi/LAT data, for gamma ray
signatures from the pair annihilation of WIMP dark matter in the GeV energy
band. From this, we present the constraints on the annihilation cross section
for the bb-bar, W+W- and gamma-gamma channels, derived from the non-detection
of a characteristic signal from five nearby high galactic latitude galaxy
clusters (Centaurus, Coma, Virgo, Perseus and Fornax). We discuss the potential
of a boost to the signal due the presence of substructures in the DM halos of
selected objects, as well as the impact of uncertainties in DM profiles on the
presented results. We assert that the obtained limits are, within a small
factor, comparable to the best available limits of those based on Fermi/LAT
observations of dwarf spheroidal galaxies.
