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首页> 外文会议>Proceedings of the 32nd International Cosmic Ray Conference >Constraints on Dark Matter annihilation from H.E.S.S. observations of the Fornax Galaxy Cluster
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Constraints on Dark Matter annihilation from H.E.S.S. observations of the Fornax Galaxy Cluster

机译：H.E.S.S.对暗物质an灭的限制Fornax星系团的观测

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摘要

Galaxy clusters are one of the largest gravitationally bound structures observed in the Universe. Their mainmass component is dark matter, making up about 80% of their total mass budget. The annihilation of dark matterparticles is expected to give a sizeable very-high energy gamma-ray signal. Recent N-body numerical simulations havepredicted the existence of a large amount of substructures in the form of sub-halos populating the host halo. In the case ofgalaxy clusters, substructures may contribute significantly to the overall gamma-ray flux from dark matter annihilation.The H.E.S.S. array of four identical imaging atmospheric Cherenkov telescopes has observed the Fornax galaxy clusterfor a total of 11 hours of live time. No significant signal is found, both for point-like and extended source analyses.Assuming several different models of particle dark matter, upper-limits on the dark matter self-annihilation cross-section(v ) as a function of the dark matter particle mass are derived. Possible enhancements of the dark matter annihilationrate, as could be caused by halo substructures or the Sommerfeld effect, are studied. For a dark matter particle massTeV, the Sommerfeld resonance lowers the limit to level of 10-25 cm 3 s-1
机译：星系团是宇宙中最大的引力束缚结构之一。它们的主要成分是暗物质，约占总预算的80％。暗物质颗粒的an灭有望产生相当大的非常高能量的伽马射线信号。最近的N体数值模拟已经预测了大量亚结构的存在，这些亚结构以亚晕的形式存在于宿主晕圈中。在星系团的情况下，子结构可能对暗物质ni灭产生的总体伽马射线通量有显着贡献。四个相同的大气Cherenkov望远镜组成的阵列观测到了Fornax星系团，总共观测了11个小时。在点状和扩展源分析中均未发现明显的信号。假设有几种不同的粒子暗物质模型，暗物质自-灭截面（v）的上限是暗物质粒子质量的函数派生。研究了可能由光晕亚结构或Sommerfeld效应引起的暗物质an灭率的增强。对于暗物质质量TeV，Sommerfeld共振将极限降低到10-25 cm 3 s-1的水平

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