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Centre for Space Research, North-West University, Potchefstroom 2520, South Africa.
Universität Hamburg, Institut für Experimentalphysik, Luruper Chaussee 149, D 22761 Hamburg, Germany.
Phys Rev Lett. 2016 Oct 7;117(15):151302. doi: 10.1103/PhysRevLett.117.151302.
A search for dark matter linelike signals iss performed in the vicinity of the Galactic Center by the H.E.S.S. experiment on observational data taken in 2014. An unbinned likelihood analysis iss developed to improve the sensitivity to linelike signals. The upgraded analysis along with newer data extend the energy coverage of the previous measurement down to 100 GeV. The 18 h of data collected with the H.E.S.S. array allow one to rule out at 95% C.L. the presence of a 130 GeV line (at l=-1.5°, b=0° and for a dark matter profile centered at this location) previously reported in Fermi-LAT data. This new analysis overlaps significantly in energy with previous Fermi-LAT and H.E.S.S.
No significant excess associated with dark matter annihilations was found in the energy range of 100 GeV to 2 TeV and upper limits on the gamma-ray flux and the velocity weighted annihilation cross section are derived adopting an Einasto dark matter halo profile. Expected limits for present and future large statistics H.E.S.S. observations are also given.
H.E.S.S.实验利用2014年获取的观测数据，在银河系中心附近搜索暗物质线状信号。开展了无分箱似然分析以提高对线状信号的灵敏度。升级后的分析以及更新的数据将先前测量的能量覆盖范围扩展至低至100 GeV。用H.E.S.S.阵列收集的18小时数据使得能够在95%置信水平排除先前费米大面积望远镜（Fermi-LAT）数据中报告的130 GeV谱线的存在（在银纬b = 0°、银经l = -1.5°且暗物质分布以该位置为中心的情况下）。这项新分析在能量上与先前的费米大面积望远镜和H.E.S.S.有显著重叠。
在100 GeV至2 TeV能量范围内未发现与暗物质湮灭相关的显著过量，并且采用埃纳斯托（Einasto）暗物质晕分布推导出了伽马射线通量和速度加权湮灭截面的上限。还给出了当前和未来大统计量H.E.S.S.观测的预期极限。
