标题： 基于矮星系不规则星系的HAWC观测对暗物质截面和寿命的限制 显示英文标题

标题： Constraints on cross-section and lifetime of dark matter with HAWC Observations of dwarf Irregular galaxies

摘要： 矮星系不规则星系（dIrr）的动力学被认为主要由暗物质主导。同时观测到这些星系具有较低的恒星形成率和金属丰度，并且预计不会在超高能量下产生伽马射线辐射。由于它们的距离、暗物质含量以及数量众多，dIrr 星系是地面宽视场伽马射线实验（如 HAWC）进行间接暗物质搜寻的理想目标。我们分析了 HAWC 视野内 31 个 dIrr 星系位置的数据，未发现显著过量信号。在这里，我们给出了弱相互作用大质量粒子（其质量在 1 到 100 TeV 之间）湮灭截面和衰变寿命的单独限制与联合限制。 显示英文摘要

摘要： It has been shown that the dynamics of dwarf Irregular (dIrr) galaxies are dominated by dark matter. It is also observed that these galaxies have low star formation rates and metallicities, and no gamma-ray emission at ultra very high energies is expected. Because of their distance, dark matter content and vast number, dIrr galaxies are good targets to perform indirect dark matter searches by ground-based and wide field of view gamma-ray experiments, like HAWC. We analyzed data at the position of 31 dIrr galaxies within the HAWC field-of-view and no significant excess was found. Here, we present the individual and combined limits on the annihilation cross-section and decay lifetime of weakly interacting massive particles with a mass between 1 and 100 TeV.