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arXiv 0907.1197astro-ph.HE
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超新星遗迹Cas A的流体动力学:祖先演化对速度结构和聚集的影响

The hydrodynamics of the supernova remnant Cas A: The influence of the progenitor evolution on the velocity structure and clumping

B. van Veelen, N. Langer, J. Vink, G. García-Segura, A. J. van Marle

摘要:

对于Cas A SNR,所提出的祖细胞模型存在很大差异。这些差异之一是存在或不存在的沃尔夫-拉叶(WR)阶段的祖星。祖星的质量损失历史强烈影响超新星遗迹(SNR)的形状。在本文中,我们调查的祖先星的Cas A是否有一个WR阶段或没有,以及它可能已经持续了多久。我们进行了二维多物种流体动力学模拟的CSM周围的祖星的几个WR的生命时间,每个其次是相互作用的超新星喷出物与CSM。然后,我们研究了WR相长度的影响,并将模拟结果与Cas A的观测结果进行了比较。对于具有不同WR寿命的模型,CSM结构的差异对所得SNR具有强烈影响。随着WR寿命的增加,SNR的反向冲击速度减小,并且在冲击材料中观察到的速度范围增加。此外,如果发生WR相位,则WR壳的反射器将在所得SNR中可见。将我们的结果与观测结果进行比较表明,Cas A的祖星没有WR相位。我们还发现,在Cas A中的准静态絮状物(QSF)是不一致的,从WR壳,已被冲击和加速与SN喷出物的相互作用的团块。我们还可以得出结论,对于在短的< 15000年WR阶段期间由风塑造的CSM中发生的SN爆炸,WR壳的团块将在SNR内可见。

英文摘要:

There are large differences in the proposed progenitor models for the Cas A SNR. One of these differences is the presence or absence of a Wolf-Rayet (WR) phase of the progenitor star. The mass loss history of the progenitor star strongly affects the shape of the Supernova remnant (SNR). In this paper we investigate whether the progenitor star of Cas A had a WR phase or not and how long it may have lasted. We performed two-dimensional multi-species hydrodynamical simulations of the CSM around the progenitor star for several WR life times, each followed by the interaction of the supernova ejecta with the CSM. We then looked at the influence of the length of the WR phase and compared the results of the simulations with the observations of Cas A. The difference in the structure of the CSM, for models with different WR life times, has a strong impact on the resulting SNR. With an increasing WR life time the reverse shock velocity of the SNR decreases and the range of observed velocities in the shocked material increases. Furthermore, if a WR phase occurs, the remainders of the WR shell will be visible in the resulting SNR. Comparing our results with the observations suggests that the progenitor star of Cas A did not have a WR phase. We also find that the quasi-stationary flocculi (QSF) in Cas A are not consistent with the clumps from a WR shell that have been shocked and accelerated by the interaction with the SN ejecta. We can also conclude that for a SN explosion taking place in a CSM that is shaped by the wind during a short < 15000 yr WR phase, the clumps from the WR shell will be visible inside the SNR.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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