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H.E.S.S. observations of galaxy clusters

Abstract : 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.
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http://hal.in2p3.fr/in2p3-00166927
Contributor : Dominique Girod <>
Submitted on : Monday, August 13, 2007 - 10:29:39 AM
Last modification on : Friday, April 10, 2020 - 5:28:03 PM

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  • HAL Id : in2p3-00166927, version 1
  • ARXIV : 0708.1384

Citation

W. Domainko, W. Benbow, J. A. Hinton, O. Martineau-Huynh, M. de Naurois, et al.. H.E.S.S. observations of galaxy clusters. 30th International Cosmic Ray Conference - 30th ICRC, Jul 2007, Merida, Mexico. ⟨in2p3-00166927⟩

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