arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 0907.3001astro-ph.COastro-ph.HE
收藏

H.E.S.S.的新结果星系团观测

New results from H.E.S.S. observations of galaxy clusters

W. Domainko, D. Nedbal, J. A. Hinton, O. Martineau-Huynh

摘要:

星系团被认为含有大量的宇宙射线。从无线电和可能的硬X射线波段可以知道,星团是宇宙中空间上最广泛的非热辐射发射体。由于它们含有宇宙射线,星系团也是VHE(>100 GeV)伽马射线的潜在来源。最近,H.E.S.S.观测到了附近的大质量星系团Abell 85。作为正在进行的活动的一部分,在VHE伽马射线中进行非常深的暴露实验。在星团的位置没有发现明显的伽马射线信号。没有探测到这个物体限制了这个系统中宇宙射线的总能量。对于-2.1的宇宙射线的硬谱指数,并且如果宇宙射线能量密度遵循大尺度气体密度分布,则这些非热粒子中的能量相对于团簇内介质的总热能的分数的限制对于该特定团簇为8%。此值处于模型预测的下限。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑