标题： 用费米-拉丁语数据伽马射线天文台14年数据限制衰减非常重的暗物质从星系团 显示英文标题

标题： Constraining decaying very heavy dark matter from galaxy clusters with 14 year Fermi-LAT data

摘要： 由于星系团富含大量暗物质，它们是间接探测暗物质的有前景的目标。利用来自七个近邻星系团的费米伽马射线太空望远镜（Fermi-LAT）长达14年的数据，我们对寿命衰变的非常重的暗物质粒子设定了限制，这些粒子的质量范围从$10^3$GeV 到$10^{16}$GeV。我们考虑了多种衰变通道，并计算了暗物质产生的瞬时伽马射线和电子/正电子。此外，我们还考虑了由初级伽马射线和电子/正电子诱导的电磁级联，并搜索了来自星系团方向的伽马射线信号。我们采用了暗物质晕的Navarro-Frenk-White分布，并使用轮廓似然法在95%置信水平下设定了暗物质寿命的下限。我们的结果与通过其他星系团伽马射线观测得到的结果具有竞争力，并为现有衰变非常重暗物质的间接搜索提供了互补的约束。 显示英文摘要

摘要： Galaxy clusters are promising targets for indirect detection of dark matter thanks to the large dark matter content. Using 14 years of Fermi-LAT data from seven nearby galaxy clusters, we obtain constraints on the lifetime of decaying very heavy dark matter particles with masses ranging from $10^3$ GeV to $10^{16}$ GeV. We consider a variety of decaying channels and calculate prompt gamma rays and electrons/positrons from the dark matter. Furthermore, we take into account electromagnetic cascades induced by the primary gamma rays and electrons/positrons, and search for the resulting gamma-ray signals from the directions of the galaxy clusters. We adopt a Navarro-Frenk-White profile of the dark matter halos, and use the profile likelihood method to set lower limits on the dark matter lifetime at a 95% confidence level. Our results are competitive with those obtained through other gamma-ray observations of galaxy clusters and provide complementary constraints to existing indirect searches for decaying very heavy dark matter.