0820002

This is a confirmatory resubmission of the successful AO7 proposal 0720003 currently being carried out requesting a completion of the programme as described in the original proposal. Recently significant advances have been made in understanding of the diffuse Galactic continuum emission observed by SPI on INTEGRAL. The hard power-law component has been identified with inverse-Compton emission from relativistic (GeV) electrons on the cosmic microwave background and Galactic infrared radiation field. The observed intensity is in good agreement with detailed predictions from the GALPROP model which accounts for both primary and secondary electrons and positrons. We propose to exploit this with INTEGRAL to obtain a probe of the distribution of cosmic-ray electrons in the Galaxy in particular in the Galactic halo seen at high latitudes. To this end we propose a multi-year scan covering a wide latitude range in the inner Galaxy significantly deepening the exposure over what is currently available. The decreasing background due to the solar cycle will improve the signal-to-noise over that for the INTEGRAL mission so far. The results will have implications for Fermi-LAT which is now in operation - taken together the data from the two missions will constrain the cosmic-ray electron spectrum at GeV energies and help to give an unambiguous decomposition of the diffuse gamma-ray sky. [truncated! Please see actual data for full text]

本文件为获批AO7提案0720003的确认重提交申请，当前该提案正在执行中，此次申请旨在按原提案所述完成全部科研项目。近期，针对国际伽玛射线天体物理实验室（INTEGRAL）搭载的伽玛射线谱仪（SPI）所观测到的弥漫银河连续谱辐射，学界在认知层面取得了重要进展。现已确认，其中的硬幂律成分来自相对论性（GeV量级）电子与宇宙微波背景及银河红外辐射场之间的逆康普顿散射辐射。观测得到的辐射强度与GALPROP模型的详细预测结果吻合良好，该模型同时考虑了原初与次生电子及正电子的贡献。我们提议借助INTEGRAL开展相关观测，以探测银河内宇宙线电子的分布，尤其是在高银纬区域可见的银河晕中的分布。为此，我们提议开展为期多年的巡天观测，覆盖银心区域的宽银纬范围，大幅提升现有观测的曝光深度。受太阳活动周期影响，背景辐射将逐渐衰减，观测信噪比将相较于INTEGRAL任务迄今的已有数据得到进一步提升。本研究结果将对已投入运行的费米大视场望远镜（Fermi-LAT）具有重要参考价值——两项任务的数据结合后，将约束GeV能区的宇宙线电子能谱，并助力实现弥漫伽马射线天空的无歧义分解。[文本已截断！请查阅完整原文以获取全部内容]