发表机构
Niels Bohr Institute, University of Copenhagen; Taras Shevchenko National University of Kyiv; Institut für Astronomie und Astrophysik Tübingen, Universität Tübingen(哥本哈根大学尼尔斯·玻尔研究所; 基辅塔拉斯·舍甫琴科国立大学; 蒂宾根大学天文与天体物理研究所)
机构由 AI 辅助整理,请以论文原文为准。AI 中文总结
针对XRISM低计数率观测提出新搜寻策略,在3.48-3.56 keV波段探测银河系晕暗物质衰变线,获得更强界限,并发现3.5311 keV处约3σ的未识别残余信号。
AI 中文摘要
对keV质量暗物质辐射衰变的搜寻一直受到能量分辨率的限制。我们提出了一种针对XRISM/Resolve低计数率观测的策略,并搜寻3.48-3.56 keV波段内来自银河系晕的衰变线。尽管曝光较低,我们的界限比来自XRISM对星系团观测的界限更强。我们还识别出一个在E = 3.5311 keV处的残余信号,具有约3σ的局部显著性,与先前报道的未识别特征重合,且没有合理的原子或仪器对应物。随着更多指向数据的可用,这些界限将继续收紧。
英文摘要
Searches for radiative decays of keV-mass dark matter have been limited by energy resolution. We propose a strategy for the XRISM/Resolve low count rate observations, and search the 3.48-3.56 keV band for a decay line from the Milky Way halo. Despite a lower exposure, our bounds are stronger than those from XRISM observations of galaxy clusters. We also identify a residual at E = 3.5311 keV with ~3sigma local significance, coincident with the previously reported unidentified feature, and having no plausible atomic or instrumental counterpart. These bounds will continue to tighten as additional pointings become available.