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arXiv 2001.03716astro-ph.HE
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变绝热指数二元流体的自相似爆炸波

Self-similar Blast Wave for A Two-component Fluid with Variable Adiabatic Index

Yiran Zhang, Edison Liang, Siming Liu

摘要:

本文提出了一种自相似(SS)解,求解了球形强爆炸波(BW)通过激波前沿具有有效相对论粒子加速的均匀等离子体时的流体动力学非相对论流动。该流动由具有相对论分量的理想双流体模型描述,使得激波后气体具有从$ 5/3 $到$ 4/3 $变化的有效SS绝热指数$ γ$。这个解决方案进行了数值计算,并与标准的Sedov解决方案进行了比较。我们发现,在我们的解决方案中的BW中心是占主导地位的相对论分量与$ γ=4/3 $的扩张的发散,和相对论分量占主导地位的内部为一个中等的加速效率在激波阵面。相对论粒子加速的总效率可以提高$ 2 $的一个因素,由于在膨胀过程中的相对论组件的绝热能量损失率较慢。相对论分量占主导地位的趋势在膨胀的天体物理学双流体系统中可能是常见的,如超新星遗迹,射电星系的叶。

英文摘要:

We propose a self-similar (SS) solution to hydrodynamic non-relativistic flow behind a spherical strong blast wave (BW) passing through a homogeneous plasma with efficient relativistic particle acceleration at the shock front. The flow is described by an ideal two-fluid model with a relativistic component so that the post-shock gas has an effective SS adiabatic index $ γ$ varying from $ 5/3 $ to $ 4/3 $. This solution is calculated numerically and compared with the standard Sedov solution. We find that the BW center in our solution is dominated by the relativistic component with $ γ=4/3 $ for the divergence of expansion there, and the relativistic component dominates the interior for a moderate acceleration efficiency at the shock front. The overall efficiency of relativistic particle acceleration can be enhanced by a factor of $ 2 $ due to the slower adiabatic energy loss rate of the relativistic component during expansion. Tendency of the dominance by the relativistic component may be common in expanding astrophysical two-fluid systems such as supernova remnants, lobes of radio galaxies.

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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