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Galaxy clusters are promising targets for indirect detection of dark matterthanks to the large dark matter content. Using 14 years of Fermi-LAT data fromseven nearby galaxy clusters, we obtain constraints on the lifetime of decayingvery heavy dark matter particles with masses ranging from $10^3$ GeV to$10^{16}$ GeV. We consider a variety of decaying channels and calculate promptgamma rays and electrons/positrons from the dark matter. Furthermore, we takeinto account electromagnetic cascades induced by the primary gamma rays andelectrons/positrons, and search for the resulting gamma-ray signals from thedirections of the galaxy clusters. We adopt a Navarro-Frenk-White profile ofthe dark matter halos, and use the profile likelihood method to set lowerlimits on the dark matter lifetime at a 95% confidence level. Our results arecompetitive with those obtained through other gamma-ray observations of galaxyclusters and provide complementary constraints to existing indirect searchesfor decaying very heavy dark matter.

Constraining decaying very heavy dark matter from galaxy clusters with 14 year Fermi-LAT data