Decaying dark matter: a stacking analysis of galaxy clusters to improve on current limits

C. Combet (1) , D. Maurin (1) , E. Nezri , E. Pointecouteau , J.A. Hinton , R. White

1 LPSC - Laboratoire de Physique Subatomique et de Cosmologie

We show that a stacking approach to galaxy clusters can improve current limits on decaying dark matter by a factor $\gtrsim 5-100$, with respect to a single source analysis, for all-sky instruments such as Fermi-LAT. Based on the largest sample of X-ray-selected galaxy clusters available to date (the MCXC meta-catalogue), we provide all the astrophysical information, in particular the astrophysical term for decaying dark matter, required to perform an analysis with current instruments.

Domaines: Phénomènes cosmiques de haute energie [astro-ph.HE]; Phénomènes cosmiques de haute energie [astro-ph.HE]; Physique des Hautes Energies - Phénoménologie [hep-ph]

C. Combet, D. Maurin, E. Nezri, E. Pointecouteau, J.A. Hinton, et al.. Decaying dark matter: a stacking analysis of galaxy clusters to improve on current limits. Physical Review D, 2012, 85, pp.063517. ⟨10.1103/PhysRevD.85.063517⟩. ⟨in2p3-00677019⟩