SEARCH FOR DARK MATTER ANNIHILATION SIGNALS FROM THE FORNAX GALAXY CLUSTER WITH H.E.S.S.

SEARCH FOR DARK MATTER ANNIHILATION SIGNALS FROM THE FORNAX GALAXY CLUSTER WITH H.E.S.S.
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使用 H.E.S.S. 搜索来自 Fornax 星系团的暗物质湮灭信号

DOI:
10.1088/0004-637x/750/2/123
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发表时间:
2012
期刊:
The Astrophysical Journal
影响因子:
--
通讯作者:
Abramowski A
Abramowski A
中科院分区:
--
文献类型:
--
作者:
Abramowski A

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利用高能立体观测系统对天炉座星系团进行了14.5小时的观测,寻找暗物质湮灭产生的甚高能(VHE; E> 100 GeV)γ射线。在搜索点状和扩展发射时未发现显著信号。利用几种DM密度分布模型,导出了DM速度加权湮没截面< σv>随DM粒子质量变化的上限。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。研究了由于DM宿主晕的DM子结构或Sommerfeld效应可能引起的DM湮没γ射线通量的增强。另外还讨论了内韧致辐射和逆康普顿辐射对γ射线的贡献。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< σv> 95% CL <$10 − 23 cm 3 s− 1的值,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,子结构的增强和索末菲共振效应导致速度加权湮没截面上限为< σv> 95% CL <$10 − 26 cm 3 s− 1。
The Fornax galaxy cluster was observed with the High Energy Stereoscopic System for a total live time of 14.5 hr, searching for very high energy (VHE; E> 100GeV) γ-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< σv> 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 γ-ray flux, due to DM substructures of the DM host halo, or from the Sommerfeld effect, are studied. Additional γ-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< σv> 95% CL∼ 10− 23 cm 3 s− 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> 95% CL∼ 10− 26 cm 3 s− 1.
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