23-28 June 2014
Amsterdam
Europe/Zurich timezone

Search for DM-induced gamma-rays from Galaxy Clusters with the Fermi-LAT

23 Jun 2014, 14:55
10m
Room 6 (Tuschinski Theatre)

Room 6

Tuschinski Theatre

Presentation Dark Matter Indirect Detection Dark Matter: Indirect Detection

Speaker

Mr Stephan Zimmer (OKC/ Stockholm University)

Description

Galaxy Clusters are the largest gravitationally bound structures in our universe. The majority of their mass is believed to be in the form of dark matter (DM). If DM manifests itself as weakly interacting massive particles (WIMPs) these WIMPs may self-annihilate or decay, and galaxy clusters would then be excellent targets for searches of DM-induced gamma rays. In addition, N-body cosmological simulations predict galaxy clusters to host thousands of DM sub halos. The presence of these substructures may yield an enhancement of the expected DM-induced gamma-ray flux, making galaxy clusters potentially observable with current gamma-ray observatories such as the Large Area Telescope on board the Fermi satellite. Here we present initial results of a joint likelihood analysis searching for DM signatures towards the direction of a sample of 34 galaxy clusters in 5 years of existing LAT data. In the absence of a DM signal, we provide updated constraints on the DM annihilation cross section, which are possible thanks to our improved understanding of the DM modeling and the gamma-ray sky.

Primary author

Mr Stephan Zimmer (OKC/ Stockholm University)

Co-authors

Prof. Jan Conrad (OKC/ Stockholm University) Mrs Maja Llena-Garde (OKC/ Stockholm University)

Presentation Materials