We study the instrumental features of photons from the peak observed at $E_γ=130$ GeV in the spectrum of Fermi-LAT data. We use the {\sc sPlots} algorithm to reconstruct -- seperately for the photons in the peak and for background photons -- the distributions of incident angles, the recorded time, features of the spacecraft position, the zenith angles, the conversion type and details of the energy and direction reconstruction. The presence of a striking feature or cluster in such a variable would suggest an instrumental cause for the peak. In the publically available data, we find several suggestive features which may inform further studies by instrumental experts, though the size of the signal sample is too small to draw statistically significant conclusions.
费米伽马射线太空望远镜(英语:Fermi Gamma-ray Space Telescope)的大面积望远镜(英语:Large Area Telescope)是一个对转换望远镜,对超过40个能量十年的伽马射线敏感,介于20 MeV和300 GeV之间。LAT与伽马射线暴监测器(GBM)-任务上的另一种仪器-协同作用,在研究伽马射线暴(GRB)方面,在光谱覆盖范围、有效面积和仪器死时间方面具有前所未有的灵敏度。我们将回顾GRB的Fermi-LAT观测的主要结果,介绍GeV能区GRB的主要性质。
Spectral and spatial variations of the diffuse gamma-ray background in the vicinity of the Galactic plane and possible nature of the feature at 130 GeV
Tentative observation of a gamma-ray line at the Fermi LAT
使用费米大天区望远镜43个月的公共伽马射线数据,我们发现在接近银河系中心的区域,能量为130 GeV,超过4.6 sigma,这与暗物质湮灭的伽马射线线并不矛盾。当考虑到别处效应时,观察到的签名的显著性为3.2西格玛。如果按照暗物质粒子湮灭为光子对的观点来解释,观测结果表明部分湮灭截面约为10^-27 cm ^3 s ^-1,暗物质质量约为130 GeV。我们回顾了统计分析的各个方面,并对可能的工具适应症进行了评论。
Decisive evidence for a global cosmic-ray feature in gamma-ray data
Instituto de Astrofísica de Canarias(加那利天体物理研究所);Universidad de La Laguna(拉帕鲁尼亚大学);Universidad Autónoma de Madrid(马德里自治大学);Instituto de Física Teórica UAM-CSIC(马德里自治大学-西班牙国家科研中心理论物理研究所);INFN Sezione di Pisa(意大利国家核物理研究所比萨分部)