arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1202.3593astro-ph.HE
收藏

在Ia型超新星遗迹演化中喷出物成团和加速宇宙射线的反反应的作用

Role of ejecta clumping and back-reaction of accelerated cosmic rays in the evolution of Type Ia supernova remnants

S. Orlando, F. Bocchino, M. Miceli, O. Petruk, M. L. Pumo

摘要:

我们通过详细的3D MHD建模研究了喷出物的初始聚集和宇宙射线(CR)的有效加速在确定Ia型超新星遗迹(SNR)冲击后区域密度结构中所发挥的作用。我们的模型描述了通过磁化星际介质(ISM)的SNR的扩展,包括初始的喷射物和冲击动力学的影响,由于加速CR的反反应。将模型预测与SN 1006的观测结果进行比较。我们发现,只有加速的CR的反作用不能再现所观察到的前向激波(FS)和接触不连续(CD)之间的分离,除非通过CR加速和逃逸的能量损失非常大,并且与平行度角无关。相反,即使不需要加速的CR,喷出物的聚集也可以自然地再现在SN 1006中观察到的小分离和突起的出现。我们的结论是,FS-CD分离是一个探头的喷出物结构在爆炸时,而不是一个探头的CR加速在年轻的SNR的效率。

英文摘要:

We investigate the role played by initial clumping of ejecta and by efficient acceleration of cosmic rays (CRs) in determining the density structure of the post-shock region of a Type Ia supernova remnant (SNR) through detailed 3D MHD modeling. Our model describes the expansion of a SNR through a magnetized interstellar medium (ISM), including the initial clumping of ejecta and the effects on shock dynamics due to back-reaction of accelerated CRs. The model predictions are compared to the observations of SN 1006. We found that the back-reaction of accelerated CRs alone cannot reproduce the observed separation between the forward shock (FS) and the contact discontinuity (CD) unless the energy losses through CR acceleration and escape are very large and independent of the obliquity angle. On the contrary, the clumping of ejecta can naturally reproduce the observed small separation and the occurrence of protrusions observed in SN 1006, even without the need of accelerated CRs. We conclude that FS-CD separation is a probe of the ejecta structure at the time of explosion rather than a probe of the efficiency of CR acceleration in young SNRs.

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。

↑