G349.7 + 00.2 is a young Galactic supernova remnant (SNR) with a mushroom morphology in radio and X-rays, and it has been detected across the entire electromagnetic spectrum from radio to high energy γ -rays. Moreover, the remnant is interacting with a molecular cloud based on the observations in the radio and infrared band. The reason for the formation of the periphery and the dynamical evolution of the remnant is investigated using 3D hydrodynamical (HD) simulations. Under the assumption that the supernova ejecta is evolved in the medium with a density gradient, the shell is composed of two hemispheres with different radii, and the smaller hemisphere is in relatively dense media. The resulting periphery of remnant is consistent with detected ones, and it can be concluded that the peculiar periphery of G349.7+00.2 can be reproduced as the remnants interacting with the medium with a density gradient.

中文翻译：

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用密度梯度研究介质中超新星残余G349.7 + 00.2的形态

G349.7 + 00.2是年轻的银河超新星遗留物（SNR），在无线电和X射线中呈蘑菇状，已在从无线电到高能γ射线的整个电磁光谱中被检测到。此外，根据无线电和红外波段的观测结果，残余物正在与分子云相互作用。使用3D流体动力学（HD）模拟研究了外围形成和残余物动态演变的原因。在超新星喷射在密度梯度介质中演化的假设下，壳层由两个半径不同的半球组成，较小的半球处于相对密集的介质中。所产生的残余边缘与检测到的残余边缘一致，可以断定G349.7 + 00的特殊边缘。