暗物质谱线搜寻与切伦科夫望远镜阵列
Dark Matter Line Searches with the Cherenkov Telescope Array
AI总结：
本研究评估了切伦科夫望远镜阵列对暗物质湮灭或衰变产生的单色伽马射线信号的探测灵敏度，发现对高于300 GeV的暗物质，探测极限可改善一个数量级，并考虑了仪器系统不确定性，确立了新的观测标准。
摘要：
单色伽马射线信号是湮灭或衰变暗物质粒子的一种潜在确凿证据，这类信号相对容易与天体物理或仪器背景区分开来。我们基于对银河系中心区域以及若干矮球状星系的观测，提供了切伦科夫望远镜阵列（CTA）对此类信号灵敏度的最新评估。我们发现，对于质量超过300 GeV的暗物质，现有极限和探测前景将得到显著改善，在多TeV范围内可提升达一个数量级。这表明，作为世界上最大且最灵敏的高能伽马射线天文台，CTA将在此方面为伽马射线天文学树立新标准，这尤其得益于其在TeV能量下出色的能量分辨率以及聚焦于暗物质密度较高区域的观测策略。在我们的整个分析中，我们使用了最新的仪器响应函数，并在统计处理中全面模拟了仪器系统不确定性的影响。我们还展示了其他具有尖锐光谱特征（如盒状谱）的潜在信号的结果，这些信号同样能非常清晰地指向粒子暗物质的起源。
英文摘要：
Monochromatic gamma-ray signals constitute a potential smoking gun signature for annihilating or decaying dark matter particles that could relatively easily be distinguished from astrophysical or instrumental backgrounds. We provide an updated assessment of the sensitivity of the Cherenkov Telescope Array (CTA) to such signals, based on observations of the Galactic centre region as well as of selected dwarf spheroidal galaxies. We find that current limits and detection prospects for dark matter masses above 300 GeV will be significantly improved, by up to an order of magnitude in the multi-TeV range. This demonstrates that CTA will set a new standard for gamma-ray astronomy also in this respect, as the world's largest and most sensitive high-energy gamma-ray observatory, in particular due to its exquisite energy resolution at TeV energies and the adopted observational strategy focussing on regions with large dark matter densities. Throughout our analysis, we use up-to-date instrument response functions, and we thoroughly model the effect of instrumental systematic uncertainties in our statistical treatment. We further present results for other potential signatures with sharp spectral features, e.g.~box-shaped spectra, that would likewise very clearly point to a particle dark matter origin.
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