利用H.E.S.S对矮星系的暗物质谱线搜索
Dark matter line searches towards dwarf galaxies with H.E.S.S
摘要：
高能$γ$ -射线是寻找致密环境中暗物质粒子湮灭的强有力的探测器。在几个DM粒子模型中，它们的湮灭产生了特征性的特征，例如在它们的能谱中的线、凸起或截止。高能立体系统（H.E.S.S.）的成像大气切伦科夫望远镜是非常适合从多TeV质量DM粒子搜索这样的功能。本星系群中的矮椭球星系（dSphs）是银河系中最常见的卫星，被认为主要受DM的引力约束，DM的质量是可见物质的O（10 3）倍。在过去十年中，H.E.S.S.开展了几次关于矮卫星星系的观测活动。总共暴露超过140小时。在此对观察结果进行了审查。在没有清晰信号的情况下，使用信号和背景的预期光谱和空间形态来导出对产生线状信号的颗粒模型的DM颗粒湮灭截面的约束。所有矮星系的数据的组合允许显着提高HESS的灵敏度。
英文摘要：
High energy $γ$-rays are powerful probes in the search for annihilations of dark matter (DM) par- ticles in dense environments. In several DM particle models their annihilation produces characteristic features such as lines, bumps or cut-offs in their energy spectrum. The High Energy Stereoscopic System (H.E.S.S.) of imaging atmospheric Cherenkov telescopes is perfectly suited to search for such features from multi-TeV mass DM particles. The Dwarf Spheroidal Galaxies (dSphs) of the Local Group are the most common satellites of the Milky Way and assumed to be gravitationally bound dominantly by DM, with up to O(10 3 ) times more mass in DM than in visible matter. Over the past decade, several observational campaigns on dwarf satellite galaxies were launched by H.E.S.S. amounting to more than 140 hours of exposure in total. The observations are reviewed here. In the absence of clear signals, the expected spectral and spatial morphologies of signal and background are used to derive constraints on the DM particle annihilation cross- section for particle models producing line-like signals. The combination of the data of all the dwarf galaxies allows a significant improvement in the HESS sensitivity.
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