Simulated morphologies of non-thermal emission from the supernova remnant RX J0852.0−4622 in a turbulent medium
Simulated morphologies of non-thermal emission from the supernova remnant RX J0852.0−4622 in a turbulent medium
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DOI：
10.1093/mnras/stu1950
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发表时间：
2014-12
影响因子：
4.8
通讯作者：
J. Fang;Huan Yu;Li Zhang
中科院分区：
文献类型：
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作者：
J. Fang;Huan Yu;Li Zhang
使用三维磁流体动力学模拟研究了超新星遗迹 RX J0852.0−4622 的同步加速器辐射的 X 射线形态以及通过逆康普顿散射或质子-质子相互作用产生的 γ 射线的形态。将超新星喷射物嵌入湍流环境中进行模拟，可以获得冲击波内的密度和磁场分布。假设前向激波加速的质子数量与局部密度成正比，因为更多的质子可以以更高的密度注入到扩散激波加速过程中，从而实现了加速质子与周围物质之间的非弹性碰撞产生的发射形态。此外，假设相对论电子具有与质子相似的空间分布，可以获得同步辐射的X射线图和逆康普顿散射的γ射线图像。结果表明，激波锋面被湍流介质扭曲，并且在X射线波段和TeV γ射线波段的观测图像中，RX J0852.0−4622的非热发射形态在激波处呈现出带有明亮边缘的破碎壳，可以使用该模型进行普遍再现。可以得出结论，观察到沿激波具有明亮区域的非热发射的破碎形态是在湍流等离子体中残余演化的结果。
The morphologies of the X-rays from synchrotron radiation and the γ-rays produced via either inverse Compton scattering or proton–proton interaction for the supernova remnant RX J0852.0−4622 are investigated using a three-dimensional magnetohydrodynamic simulation. The simulation is initiated with the supernova ejecta imbedded in the turbulent environment, and the distributions of the density and the magnetic field within the shock wave can be obtained. Assuming that the number of the protons accelerated by the forward shock is proportional to the local density since more protons can be injected into the diffusive shock acceleration process with a higher density, the morphology of the emission produced via the inelastic collisions between the accelerated protons with the ambient matter is achieved. Furthermore, the X-ray map of the synchrotron radiation and the γ-ray image of the inverse Compton scattering can be obtained with the assumption that the relativistic electrons have a similar spatial distribution as the protons. The results show that the shock front is distorted by the turbulent medium, and the morphologies of the non-thermal emission from RX J0852.0−4622, which shows a broken shell with bright rims at the shock in the observed images both in the X-ray band and in the TeV γ-ray band, can be generally reproduced using the model. It can be concluded that the observed broken morphologies of the non-thermal emission with bright regions along the shock are the result of the remnant evolving in a turbulent plasma.