论文标题
Fermi-LAT检测G118.4+37.0：在Calvera Pulsar周围看到的银河光环中的超新星残留物
Fermi-LAT detection of G118.4+37.0: a supernova remnant in the Galactic halo seen around the Calvera pulsar
论文作者
论文摘要
最近在高银河纬度的Calvera Pulsar天空中发现了直径约1度的低表面亮度的非热无线电环。无线电属性指出它可能是新的超新星残留物（SNR），G118.4+37.0。我们报告了Fermi卫星上的伽马射线大面积望远镜对该地区对该地区进行了近14年观察的分析。我们检测到与无线电源的大小和位置一致的扩展GEV发射，这证实了相对论颗粒的存在。高能发射的光谱与产生无线电发射的相对论颗粒中的来源完全兼容。这些特征及其与其他孤立的SNR的相似之处确立了这一源为超新星的残留物。出现了由SNR产生的电子发射引起的从无线电到GEV能量的非热发射的简单模型。 G118.4+37.0和其他类似的分离残余物可能是在低密度环境中进化的无线电dim snr种群的一部分，显示了缓慢起源的硬GEV发射。无线电和伽马射线的未来更深入的调查可能会发现该小组的新成员。
The discovery of a non-thermal radio ring of low surface brightness about one degree in diameter has been recently reported around the location in the sky of the Calvera pulsar, at a high Galactic latitude. The radio properties point to it likely being a new supernova remnant (SNR), G118.4+37.0. We report an analysis of almost 14 years of observations of this region by the gamma-ray Large Area Telescope onboard the Fermi satellite. We detect extended GeV emission consistent with the size and location of the radio source, which confirms the presence of relativistic particles. The spectrum of the high-energy emission is fully compatible with an origin in the same relativistic particles producing the radio emission. These features and its similarities to other isolated SNRs establish this source as the remnant of a supernova. A simple model of the non-thermal emission from radio to GeV energies resulting from leptonic emission from electrons produced by the SNR is presented. G118.4+37.0 and other similar isolated remnants could be part of a radio-dim SNR population evolving in low density environments showing hard GeV emission of leptonic origin. Future deeper surveys in radio and gamma-rays could discover new members of the group.
