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arXiv 1602.08501astro-ph.HEastro-ph.COhep-exhep-ph
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扩展费米-LAT和H.E.S.S.暗物质湮灭的Gamma-ray谱线极限

Extending Fermi-LAT and H.E.S.S. Limits on Gamma-ray Lines from Dark Matter Annihilation

Stefano Profumo, Farinaldo S. Queiroz, Carlos E. Yaguna

摘要:

来自暗物质湮灭的伽马射线谱线($χχ\to γX$,其中$X=γ,h,Z$)在较低的能量下总是伴随着一个连续的伽马射线谱,该谱来自辐射修正($X=γ$)和可能存在于最终状态的第二粒子的衰变碎片($X=h,Z$)。这种与模型无关的伽马射线发射可以用来推导出不依赖于线特征的伽马射线线的新限制。虽然这样的限制预计不会那么严格,但它们可以用来探测$γ$ -射线线的存在,这些射线线的质量超过了目前望远镜可获得的最大能量。在这里,我们使用连续的伽马射线搜索从费米-LAT观测银河系矮球状星系和H.E.S.S.银河晕的观测将湮灭截面的限制扩展到单色光子到暗物质质量远远超过$500$ GeV(费米-LAT)和$20$ TeV(H.E.S.S.)。在这个大质量的制度,我们的研究结果提供了第一个约束$γ$ -射线线从暗物质湮灭。

英文摘要:

Gamma-ray lines from dark matter annihilation ($χχ\to γX$, where $X=γ,h,Z$) are always accompanied, at lower energies, by a continuum gamma-ray spectrum stemming both from radiative corrections ($X=γ$) and from the decay debris of the second particle possibly present in the final state ($X=h,Z$). This model-independent gamma-ray emission can be exploited to derive novel limits on gamma-ray lines that do not rely on the line-feature. Although such limits are not expected to be as stringent, they can be used to probe the existence of $γ$-ray lines for dark matter masses beyond the largest energies accessible to current telescopes. Here, we use continuous gamma-ray searches from Fermi-LAT observations of Milky Way dwarf spheroidal galaxies and from H.E.S.S. observations of the Galactic Halo to extend the limits on the annihilation cross sections into monochromatic photons to dark matter masses well beyond $500$ GeV (Fermi-LAT) and $20$ TeV (H.E.S.S.). In this large mass regime, our results provide the first constraints on $γ$-ray lines from dark matter annihilation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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