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arXiv 1104.1179astro-ph.HE
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有效粒子加速对Sedov-Taylor相超新星遗迹演化的影响

The Impact of Efficient Particle Acceleration on the Evolution of Supernova Remnants in the Sedov-Taylor Phase

Daniel Castro, Patrick Slane, Daniel J. Patnaude, Donald C. Ellison

摘要:

研究了宇宙射线的有效产生对绝热Sedov-Taylor相超新星遗迹演化的影响。我们通过耦合流体动力学演化和非线性扩散激波加速(DSA)来模拟SNR,并自洽地跟踪激波加热等离子体的电离态。使用等离子体发射率代码和模型的结果,我们预测热X射线发射,并将其与非热分量相结合,以获得在此能量范围内的完整光谱。因此,我们研究如何解释热X射线观测的DSA过程的效率的影响,并发现,相比测试粒子的情况下,有效的DSA的例子产生一个较小的冲击半径和速度,一个较大的压缩比,和较低强度的X射线热发射。我们还发现,一个模型,其中的冲击是不假定产生CR可以适合X射线观测特性的一个例子,有效的粒子加速,与一组不同的输入参数,特别是一个低得多的爆炸能量。此外,我们模拟了宽带非热辐射,并研究了粒子加速产生的特征。

英文摘要:

We investigate the effects of the efficient production of cosmic rays on the evolution of supernova remnants (SNRs) in the adiabatic Sedov-Taylor phase. We model the SNR by coupling the hydrodynamic evolution with nonlinear diffusive shock acceleration (DSA), and track self-consistently the ionization state of the shock-heated plasma. Using a plasma emissivity code and the results of the model, we predict the thermal X-ray emission and combine it with the non-thermal component in order to obtain the complete spectrum in this energy range. Hence, we study how the interpretation of thermal X-ray observations is affected by the efficiency of the DSA process, and find that, compared to test particle cases, the efficient DSA example yields a smaller shock radius and speed, a larger compression ratio, and lower intensity X-ray thermal emission. We also find that a model where the shock is not assumed to produce CRs can fit the X-ray observational properties of an example with efficient particle acceleration, with a different set of input parameters, and in particular a much lower explosion energy. Additionally, we model the broadband non-thermal emission, and investigate what signatures result from the acceleration of particles.

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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