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Clusters of galaxies are the largest known gravitationally bound structuresin the Universe, with masses around $10^{15}\ M_\odot$, most of it in the formof dark matter. The ground-based Imaging Atmospheric Cherenkov Telescope MAGICmade a deep survey of the Perseus cluster of galaxies using almost 400 h ofdata recorded between 2009 and 2017. This is the deepest observational campaignso far on a cluster of galaxies in the very high energy range. We search forgamma-ray signals from dark matter particles in the mass range between 200 GeVand 200 TeV decaying into standard model pairs. We apply an analysis optimizedfor the spectral and morphological features expected from dark matter decaysand find no evidence of decaying dark matter. From this, we conclude that darkmatter particles have a decay lifetime longer than $\sim10^{26}$~s in allconsidered channels. Our results improve previous lower limits found by MAGICand represent the strongest limits on decaying dark matter particles fromground-based gamma-ray instruments.

Constraining Dark Matter lifetime with a deep gamma-ray survey of the Perseus Galaxy Cluster with MAGIC