Chan Man Ho, Leung Chung Hei
The Education University of Hong Kong, Hong Kong, China.
Sci Rep. 2017 Nov 2;7(1):14895. doi: 10.1038/s41598-017-14950-4.
Recently, some very tight constraints of annihilating dark matter have been obtained from gamma-ray data of the Milky Way and Milky Way dwarf spheroidal satellite galaxies. In this article, we report that there are two excellent galaxy clusters (A2877 and Fornax) which can provide interesting constraints for annihilating dark matter. The lower limits of the dark matter mass for the thermal relic annihilation cross section are 25 GeV, 6 GeV, 130 GeV and 100 GeV respectively for the e e , μ μ , τ τ and [Formula: see text] channels. For some configuration of our working assumptions, our results improve the Fermi-LAT upper limits of annihilation cross sections by a factor of 1.3 - 1.8 for wide ranges of dark matter mass for e e , μ μ and [Formula: see text] channels, and a factor of 1.2-1.8 for τ τ channel with dark matter mass ≤100 GeV. These limits basically rule out most of the existing popular dark matter interpretation of the GeV excess in the Milky Way.
最近，从银河系及银河系矮球状卫星星系的伽马射线数据中得到了一些关于暗物质湮灭的非常严格的限制条件。在本文中，我们报告了有两个出色的星系团（A2877和天炉座），它们能够为暗物质湮灭提供有趣的限制条件。对于热遗迹湮灭截面，在电子 - 电子、渺子 - 渺子、陶子 - 陶子以及[公式：见原文]通道中，暗物质质量的下限分别为25 GeV、6 GeV、130 GeV和100 GeV。对于我们工作假设的某些配置，在电子 - 电子、渺子 - 渺子以及[公式：见原文]通道中，对于大范围的暗物质质量，我们的结果将费米大面积望远镜（Fermi-LAT）湮灭截面的上限提高了1.3至1.8倍；在陶子 - 陶子通道中，对于暗物质质量≤100 GeV的情况，上限提高了1.2至1.8倍。这些限制条件基本上排除了银河系中GeV过量现象现有的大多数流行暗物质解释。
