NEW RESULTS FROM HESS OBSERVATIONS OF GALAXY CLUSTERS

被引：10
|
作者：
Domainko, Wilfried [1 ]
Nedbal, Dalibor [2 ]
Hinton, James A. [3 ]
Martineau-Huynh, Olivier [4 ]
机构：
[1] Max Planck Inst Nucl Phys, D-69117 Heidelberg, Germany
[2] Charles Univ Prague, Inst Particle & Nucl Phys, CR-18000 Prague 6, Czech Republic
[3] Univ Leeds, Sch Phys & Astron, Leeds LS2 9JT, W Yorkshire, England
[4] Univ Paris 07, Univ Paris 06, LPNHE, CNRS,IN2P3, F-75252 Paris 5, France
来源：
INTERNATIONAL JOURNAL OF MODERN PHYSICS D | 2009年 / 18卷 / 10期
关键词：
Gamma-ray observations; galaxy clusters; Abell; 85; GAMMA-RAY EMISSION; LARGE-SCALE STRUCTURE; HALO;
D O I：
10.1142/S021827180901545X
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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.
引用
收藏
页码：1627 / 1631
页数：5
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