1. Karl Mannheim – ITPA Würzburg
Gamma rays from the Virgo and Coma clusters of galaxies
Berlin CTA-Meeting, May 4-5, 2006

2. Storage of (UHE) cosmic rays
Clusters of Galaxies
Storage of (UHE) cosmic rays
Supernova-driven winds
Radiojets from Active Galactic Nuclei
Acceleration of (UHE) cosmic rays
Cluster merger shocks
Accretion shocks
Dynamical relaxation shocks
Dark matter annihilation
Largest mass concentrations
Small-scale clumps dominance: Sorting in dM/R2
Galactic Center
Nearest halo clump (unidentified EGRET?)
Nearest rich clusters (Virgo, Coma, Perseus)
Nearest dwarf galaxies (Sagittarius, Draco)

3. Galactic Vicinity (200 kpc)

4. Local Group (2 Mpc)

5. Local Universe (60 Mpc)

6. Local Universe (300 Mpc)

7.  Coma cluster
Virgo cluster 

8. Cosmic rays in nearby clusters of galaxies
Pfrommer et al.: Cosmic ray propagation model fitted to radio and X-ray observations, employing hydrodynamical code for of intracluster medium (g-ray fluxes > 50 GeV)

9. Cosmic rays in Coma Völk et al.: Cosmic ray propagation
Reimer et al. Cosmic ray propagation
Berrington & Dermer:
Cluster merger shock

10. M 87 / Virgo Cluster C=40 C=335 Control astrophysical backgrounds:
DarkSusy scan
C=40
C=335
Control astrophysical backgrounds:
AGN in M87
CRp – interactions
MAGIC observations
have started in May 2005
Targeted observations seem promising with new – generation experiments

11. M87 SED
(ICRC)

12. 2DM ds Structure Formation ART Code (A. Klypin et al.)
3 £ 1014 solar masses; 9 million particles („Virgo Cluster“)
(sub)structure down to 3 £ 107 solar masses: clumps!
Structure Formation
2DM ds
D. Elsaesser, S. Gottloeber, A. Khalathyan and M. Steinmetz

13. Clusters are cutting-edge targets for current IACTs
Summary
Clusters are cutting-edge targets for current IACTs
Rich potential for astrophysics, cosmology, and particle physics
Origin of UHE cosmic rays
Dark matter annihilation
Role of nonthermal plasma in structure
formation
… northern location prefered for a dedicated„cluster mission“with future CTAs…