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On the Measurement of Handedness in Fermi Large Area Telescope Data
The Astrophysical Journal ( IF 4.9 ) Pub Date : 2020-07-30 , DOI: 10.3847/1538-4357/ab9744
Julia Asplund 1, 2 , Gulaugur. Jhannesson 1, 3 , Axel Brandenburg 1, 2, 4, 5
Affiliation  

A handedness in the arrival directions of high-energy photons from outside our Galaxy can be related to the helicity of an intergalactic magnetic field. Previous estimates by arXiv:1310.4826 and arXiv:1412.3171 showed a hint of a signal present in the photons observed by the Fermi Large Area Telescope (LAT). An update on the measurement of handedness in Fermi-LAT data is presented using more than 10 years of observations. Simulations are performed to study the uncertainty of the measurements, taking into account the structure of the exposure caused by the energy-dependent instrument response and its observing profile, as well as the background from the interstellar medium. The simulations are required to accurately estimate the uncertainty and to show that previously the uncertainty was significantly underestimated. The apparent signal in the earlier analysis of {\em Fermi}-LAT data is rendered non-significant.

中文翻译:

关于费米大面积望远镜数据中旋向性的测量

来自银河系外的高能光子到达方向的旋向性可能与星际磁场的螺旋度有关。arXiv:1310.4826 和 arXiv:1412.3171 之前的估计表明,费米大面积望远镜 (LAT) 观测到的光子中存在信号。使用超过 10 年的观察结果呈现了对 Fermi-LAT 数据中手性测量的更新。进行模拟以研究测量的不确定性,同时考虑到由能量相关仪器响应引起的暴露结构及其观测剖面,以及来自星际介质的背景。需要进行模拟以准确估计不确定性并表明之前的不确定性被严重低估了。
更新日期:2020-07-30
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