Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2009-07-17
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
4 pages, one figure, invited talk at the 2nd Heidelberg workshop: "High-Energy Gamma-rays and Neutrinos from Extra-Galactic So
Scientific paper
Clusters of galaxies are believed to contain a significant population of cosmic rays. From the radio and probably hard X-ray bands it is known that clusters are the spatially most extended emitters of non-thermal radiation in the Universe. Due to their content of cosmic rays, galaxy clusters are also potential sources of VHE (>100 GeV) gamma rays. Recently, the massive, nearby cluster Abell 85 has been observed with the H.E.S.S. experiment in VHE gamma rays with a very deep exposure as part of an ongoing campaign. No significant gamma-ray signal has been found at the position of the cluster. The non-detection of this object with H.E.S.S. constrains the total energy of cosmic rays in this system. For a hard spectral index of the cosmic rays of -2.1 and if the cosmic-ray energy density follows the large scale gas density profile, the limit on the fraction of energy in these non-thermal particles with respect to the total thermal energy of the intra-cluster medium is 8% for this particular cluster. This value is at the lower bounds of model predictions.
collaboration for the H. E. S. S.
Domainko Wilfried
Hinton Jim A.
Martineau-Huynh Olivier
Nedbal Dalibor
No associations
LandOfFree
New results from H.E.S.S. observations of galaxy clusters does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with New results from H.E.S.S. observations of galaxy clusters, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and New results from H.E.S.S. observations of galaxy clusters will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-110305