船帆座超新星遗迹中喷出物碎片的流体动力学模拟
Hydrodynamic modelling of ejecta shrapnel in the Vela supernova remnant
摘要：
许多超新星遗迹（SNRs）的特征是一个棘手的喷出物结构。船帆座SNR是残骸的一个很好的例子，其中分离的喷射物团块像发射X射线的子弹一样可见，已经被非常详细地观察和研究过。我们的目标是模拟船帆座SNR的喷出物弹片的演变，调查其初始参数（位置和密度）的作用，并解决热传导和辐射损失的影响。我们进行了一组2-D流体动力学模拟描述的喷出物配置文件中的密度不均匀性的演变。我们探索了不同的初始设置。我们发现，弹片的最终位置是非常敏感的初始位置在喷出物中，而对初始密度对比度的依赖性较弱。我们的模型还表明，适度过密的结可以重现船帆座SNR中观察到的分离功能。有效的热传导通过确定喷出物结与周围介质的有效混合并在团块中形成特征性细长形态来产生可检测的效果。
英文摘要：
Many supernova remnants (SNRs) are characterized by a knotty ejecta structure. The Vela SNR is an excellent example of remnant in which detached clumps of ejecta are visible as X-ray emitting bullets that have been observed and studied in great detail. We aim at modelling the evolution of ejecta shrapnel in the Vela SNR, investigating the role of their initial parameters (position and density) and addressing the effects of thermal conduction and radiative losses. We performed a set of 2-D hydrodynamic simulations describing the evolution of a density inhomogeneity in the ejecta profile. We explored different initial setups. We found that the final position of the shrapnel is very sensitive to its initial position within the ejecta, while the dependence on the initial density contrast is weaker. Our model also shows that moderately overdense knots can reproduce the detached features observed in the Vela SNR. Efficient thermal conduction produces detectable effects by determining an efficient mixing of the ejecta knot with the surrounding medium and shaping a characteristic elongated morphology in the clump.
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