论文标题
关于W44及其周围环境的伽马射线排放
On the gamma-ray emission of W44 and its surroundings
论文作者
论文摘要
我们介绍了中年超新星残留W44的9。7年Fermi-LAT数据和周围的大量分子气体复合物的分析。我们得出了三十年来壳的伽马辐射的高质量光谱能量分布。低于1 GEV的非常硬的光谱支持较早的关于辐射的辐射起源的主张。我们还确认存在两个延长的$γ$射线结构，该结构位于其主要轴线的两个相对边缘。基于高分辨率气体图，我们证明了伽马射线结构是由增强的宇宙射线密度而不是气体分布的梯度引起的。我们认为，揭示的宇宙射线“云”表明，高能颗粒沿着残留物的磁场从壳上逃脱了壳的各向异性特征。
We present the analysis of 9.7 years Fermi-LAT data of the middle-aged supernova remnant W44 and the massive molecular gas complex that surrounds it. We derived a high-quality spectral energy distribution of gamma-radiation of the shell over three decades. The very hard spectrum below 1 GeV supports the earlier claims regarding the hadronic origin of radiation. We also confirm the presence of two extended $γ$-ray structures located at two opposite edges of the remnant along its major axis. Based on the high-resolution gas maps, we demonstrate that the gamma-ray structures are caused by the enhanced cosmic-ray density rather than the gradient of the gas distribution. We argue that the revealed cosmic-ray "clouds" suggest an anisotropic character of the escape of high-energy particles from the shell along the magnetic field of the remnant.
