Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-08-10
Astronomy and Astrophysics
Astrophysics
Contribution to the 30th ICRC, Merida Mexico, July 2007
Scientific paper
Clusters of galaxies, the largest gravitationally bound objects in the universe, are expected to contain a significant population of hadronic and leptonic cosmic rays. Potential sources for these particles are merger and accretion shocks, starburst driven galactic winds and radio galaxies. Furthermore, since galaxy clusters confine cosmic ray protons up to energies of at least 1 PeV for a time longer than the Hubble time they act as storehouses and accumulate all the hadronic particles which are accelerated within them. Consequently clusters of galaxies are potential sources of VHE (> 100 GeV) gamma rays. Motivated by these considerations, promising galaxy clusters are observed with the H.E.S.S. experiment as part of an ongoing campaign. Here, upper limits for the VHE gamma ray emission for the Abell 496 and Coma cluster systems are reported.
Benbow Wystan
de Naurois Mathieu
Domainko Wilfried
for the E. S. S. Collaboration H.
Hinton Jim A.
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