Search for a Dark Matter Annihilation Signal from the Galactic Center Halo with HESS
Search for a Dark Matter Annihilation Signal from the Galactic Center Halo with HESS
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DOI：
10.1103/physrevlett.106.161301
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发表时间：
2011-04-18
影响因子：
8.6
通讯作者：
Zechlin, H. -S.
中科院分区：
文献类型：
--
作者：
Abramowski, A.;Acero, F.;Zechlin, H. -S.
对自湮灭粒子暗物质（DM）发出的高能（VHE; >= 100 GeV）伽马射线信号的搜索是在距离银河系中心45- 150pc的投影距离r附近进行的。高能立体系统（High Energy Stereoscopic System， H.E.S.S.）伽玛射线仪在300 GeV ~ 30 TeV的能量范围内测量的背景减去伽玛射线能谱没有显示出残余伽玛射线通量的迹象。假设传统的navarro - frank - white和Einasto密度分布，我们推导出了速度加权湮灭截面作为DM粒子质量函数的极限。这些是迄今为止报道的最好的能量范围，特别是所选密度剖面参数化之间的差异很小。特别是，对于类似于1 TeV的DM粒子质量，Einasto密度剖面中排除了3 × 10(-25) cm(3) s（-1）以上的值。
A search for a very-high-energy (VHE; >= 100 GeV) gamma-ray signal from self-annihilating particle dark matter (DM) is performed towards a region of projected distance r similar to 45-150 pc from the Galactic center. The background-subtracted gamma-ray spectrum measured with the High Energy Stereoscopic System (H.E.S.S.) gamma-ray instrument in the energy range between 300 GeV and 30 TeV shows no hint of a residual gamma-ray flux. Assuming conventional Navarro-Frenk-White and Einasto density profiles, limits are derived on the velocity-weighted annihilation cross section as a function of the DM particle mass. These are among the best reported so far for this energy range and in particular differ only little between the chosen density profile parametrizations. In particular, for the DM particle mass of similar to 1 TeV, values for above 3 x 10(-25) cm(3) s(-1) are excluded for the Einasto density profile.