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arXiv 0909.3349astro-ph.HE
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TeV超新星残骸RX J1713 .7-3946中的随机电子加速:高能截止

Stochastic Electron Acceleration in the TeV Supernova Remnant RX J1713.7-3946: The High-Energy Cut-off

Zhonghui Fan, Siming Liu, Christopher L. Fryer

摘要:

在TeV辐射的轻子方案从几个观测良好的壳型TeV超新星遗迹(STTSNRs),非常弱的磁场推断。如果快速模式波产生有效的冲击下游,我们表明,他们是可行的代理商,从所观察到的光谱推断,即使在亚音速阶段的相对论电子加速,尽管这些波受到强烈的阻尼热背景离子在小耗散尺度。本文在下游速度为常数的假设下,研究了非相对论性的强非碰撞天体物理激波。湍流演化模型与Kolmogorov和Kraichnan现象。确定非热电子分布的高能量截止的过程进行检查。Kraichnan模型导致较浅的高能量截止的电子分布,并需要一个较低的下游密度比Kolmogorov模型,以适应一个给定的发射光谱。通过合理的参数,该模型解释了STTSNRs的观测,包括费米伽马射线望远镜获得的最新数据。对湍流的产生和耗散过程、超新星爆发和母星的详细研究有助于更好地理解超新星激波的本质。

英文摘要:

In the leptonic scenario for TeV emission from a few well-observed shell-type TeV supernova remnants (STTSNRs), very weak magnetic fields are inferred. If fast-mode waves are produced efficiently in the shock downstream, we show that they are viable agents for acceleration of relativistic electrons inferred from the observed spectra even in the subsonic phase, in spite that these waves are subject to strong damping by thermal background ions at small dissipation scales. Strong collisionless non-relativistic astrophysical shocks are studied with the assumption of a constant Aflven speed in the downstream. The turbulence evolution is modeled with both the Kolmogorov and Kraichnan phenomenology. Processes determining the high-energy cutoff of nonthermal electron distributions are examined. The Kraichnan models lead to a shallower high-energy cutoff of the electron distribution and require a lower downstream density than the Kolmogorov models to fit a given emission spectrum. With reasonable parameters, the model explains observations of STTSNRs, including recent data obtained with the Fermi gamma-ray telescope. More detailed studies of the turbulence generation and dissipation processes, supernova explosions and progenitors are warranted for better understanding the nature of supernova shocks.

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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