Sensitivity of CTA to gamma-ray emission from the Perseus galaxy cluster
  In these proceedings we summarize the current status of the study of the
sensitivity of the Cherenkov Telescope Array (CTA) to detect diffuse gamma-ray
emission from the Perseus galaxy cluster. Gamma-ray emission is expected in
galaxy clusters both from interactions of cosmic rays (CR) with the
intra-cluster medium, or as a product of annihilation or decay of dark matter
(DM) particles in case they are weakly interactive massive particles (WIMPs).
The observation of Perseus has been proposed as one of the CTA Key Science
Projects. In this contribution, we focus on the DM-induced component of the
flux. Our DM modelling includes the substructures we expect in the main halo
which will boost the annihilation signal significantly. We adopt an ON/OFF
observation strategy and simulate the expected gamma-ray signals. Finally we
compute the expected CTA sensitivity using a likelihood maximization analysis
including the most recent CTA instrument response functions. In absence of
signal, we show that CTA will allow us to provide stringent and competitive
constraints on TeV DM, especially for the case of DM decay.
