Cosmic ray acceleration in young supernova remnants

Cosmic ray acceleration in young supernova remnants
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年轻超新星遗迹中的宇宙射线加速

DOI:
10.1093/mnras/stt1371
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发表时间:
2013
影响因子:
4.8
通讯作者:
Schure K
Schure K
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Schure K

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在超新星残余激波的背景下,我们研究了由宇宙线逃逸电流引起的磁场放大现象。电流与宇宙射线的最大能量成反比,是冲击波速度的强烈函数。根据冲击波的演化,这对于不同的恒星周围环境是截然不同的,产生足够电流以触发限制宇宙线的非共振混合不稳定所需的宇宙射线的最大能量遵循不同的演化,并达到不同的值。我们发现,将宇宙线加速到∼几个PeV能量的最佳候选者是密集环境中的年轻残留物,例如适用于仙后座A的红色超巨风。我们还发现,对于5 μG的典型背景磁场强度,不稳定性在大约1000年后熄灭,使得SN1006正好处于宇宙线加速到高能的候选者的边缘。
We investigate the appearance of magnetic field amplification resulting from a cosmic ray escape current in the context of supernova remnant shock waves. The current is inversely proportional to the maximum energy of cosmic rays, and is a strong function of the shock velocity. Depending on the evolution of the shock wave, which is drastically different for different circumstellar environments, the maximum energy of cosmic rays as required to generate enough current to trigger the non-resonant hybrid instability that confines the cosmic rays follows a different evolution and reaches different values. We find that the best candidates to accelerate cosmic rays to ∼ few PeV energies are young remnants in a dense environment, such as a red supergiant wind, as may be applicable to Cassiopeia A. We also find that for a typical background magnetic field strength of 5 μG the instability is quenched in about 1000 years, making SN1006 just at the border of candidates for cosmic ray acceleration to high energies.
DOI: --
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