The Fermi-LAT GeV excess as a tracer of stellar mass in the Galactic bulge
The Fermi-LAT GeV excess as a tracer of stellar mass in the Galactic bulge
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DOI：
10.1038/s41550-018-0531-z
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发表时间：
2017-11
期刊：
影响因子：
14.1
通讯作者：
R. Bartels;E. Storm;C. Weniger;F. Calore
中科院分区：
文献类型：
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作者：
R. Bartels;E. Storm;C. Weniger;F. Calore
费米-LAT 数据中存在能量为几千兆电子伏且位于银河系内部的异常发射成分。目前，两个最有希望的解释是暗物质粒子的湮灭或银河系中心存在大量未解决的点源，最有可能是毫秒脉冲星。在这里，我们报告了使用近八年的 Pass 8 ULTRACLEAN Fermi-LAT 数据和 SkyFACT（一种将图像重建与模板拟合技术相结合的工具）对多余特征的分析。我们发现，在四四方方和核核球中追踪恒星质量的发射剖面比传统的暗物质剖面更受欢迎。包含凸起的模型比具有 16σ 暗物质的模型更受青睐。
An anomalous emission component at energies of a few gigaelectronvolts and located towards the inner Galaxy is present in the Fermi-LAT data. At present, the two most promising explanations are the annihilation of dark matter particles or the presence of a large population of unresolved point sources, most probably millisecond pulsars, at the Galactic Centre. Here, we report an analysis of the excess characteristics using almost eight years of Pass 8 ULTRACLEAN Fermi-LAT data with SkyFACT—a tool that combines image reconstruction with template-fitting techniques. We find that an emission profile that traces stellar mass in the boxy and nuclear bulge is preferred over conventional dark matter profiles. A model including the bulge is favoured over a model with dark matter at 16σ.