用H.E.S.S探测天炉座星系团的暗物质湮灭信号
Search for Dark Matter Annihilation Signals from the Fornax Galaxy Cluster with H.E.S.S
摘要：
利用高能立体观测系统（H.E.S.S.）对天炉座星系团进行了观测。总生存时间为14.5小时，寻找来自暗物质（DM）湮灭的极高能（VHE，E>100 GeV）伽马射线。在搜索点状和扩展发射时未发现显著信号。使用几种模型的DM密度分布，上限的DM速度加权湮没截面<sigma v>作为DM粒子质量的函数。约束来自不同的DM粒子模型，如卡鲁扎-克莱因和超对称模型所产生的。各种湮灭的最终状态被认为是。可能的DM湮没伽马射线通量的增强，由于DM主机晕的DM子结构，或从索末菲效应，进行了研究。另外还讨论了来自内部韧致辐射和逆康普顿辐射的γ射线贡献。对于质量为1 TeV的DM粒子，在95%的置信水平下，排除极限达到<sigma v>约10^-23 cm ^3 s ^-1，这取决于DM粒子模型和晕的性质。DM子结构的额外贡献可以将<σv>的上限提高两个数量级以上。在质量约为4.5 TeV时，由于子结构和索末菲共振效应的增强，速度加权湮没截面的上限在<σv> ~ 10^-26 cm ^3 s ^-1水平。
英文摘要：
The Fornax galaxy cluster was observed with the High Energy Stereoscopic System (H.E.S.S.) for a total live time of 14.5 hours, searching for very-high-energy (VHE, E>100 GeV) gamma-rays from dark matter (DM) annihilation. No significant signal was found in searches for point-like and extended emissions. Using several models of the DM density distribution, upper limits on the DM velocity-weighted annihilation cross-section <sigma v> as a function of the DM particle mass are derived. Constraints are derived for different DM particle models, such as those arising from Kaluza-Klein and supersymmetric models. Various annihilation final states are considered. Possible enhancements of the DM annihilation gamma-ray flux, due to DM substructures of the DM host halo, or from the Sommerfeld effect, are studied. Additional gamma-ray contributions from internal bremsstrahlung and inverse Compton radiation are also discussed. For a DM particle mass of 1 TeV, the exclusion limits at 95% of confidence level reach values of <sigma v> ~ 10^-23cm^3s^-1, depending on the DM particle model and halo properties. Additional contribution from DM substructures can improve the upper limits on <σv> by more than two orders of magnitude. At masses around 4.5 TeV, the enhancement by substructures and the Sommerfeld resonance effect results in a velocity-weighted annihilation cross-section upper limit at the level of <σv> ~ 10^-26cm^3s^-1.
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