超新星残骸Gamma-ray.7 $+$ 0.2中过电离等离子体的搜寻
Searching for Overionized Plasma in the Gamma-ray Emitting Supernova Remnant G349.7$+$0.2
摘要：
G349.7 $+$ 0.2是一个超新星遗迹（SNR），在分子云的稠密介质中膨胀，并与发射伽马射线的分子物质团块相互作用。我们分析了费米伽马射线空间望远镜上的大面积望远镜的伽马射线数据，在0.2 $-$ 300 GeV的能量范围内检测到G349.7 $+$ 0.2，其显著性为$\sim$ 13 $σ$，显示没有扩展的形态。伽马射线光谱的模拟显示，GeV的伽马射线发射主要来源于中性π介子的衰变，其中质子遵循一个破碎的幂律分布，在$\sim$ 12 GeV处有一个光谱断裂。为了寻找残骸东部和西部辐射复合连续谱的特征，我们分析了G349.7 $+$ 0.2的朱雀数据，没有发现过电离等离子体的证据。在本文中，我们讨论了可能的方案来解释G349.7 $+$ 0.2中的强子γ射线发射和这种SNR的混合形态性质。
英文摘要：
G349.7$+$0.2 is a supernova remnant (SNR) expanding in a dense medium of molecular clouds and interacting with clumps of molecular material emitting gamma rays. We analyzed the gamma-ray data of Large Area Telescope on board Fermi Gamma Ray Space Telescope and detected G349.7$+$0.2 in the energy range of 0.2$-$300 GeV with a significance of $\sim$13$σ$ showing no extended morphology. Modeling of the gamma-ray spectrum revealed that the GeV gamma-ray emission dominantly originates from the decay of neutral pions, where the protons follow a broken power-law distribution with a spectral break at $\sim$12 GeV. To search for features of radiative recombination continua in the eastern and western regions of the remnant, we analyzed the Suzaku data of G349.7$+$0.2 and found no evidence for overionized plasma. In this paper we discuss possible scenarios to explain the hadronic gamma-ray emission in G349.7$+$0.2 and the mixed morphology nature of this SNR.
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