arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0901.4058astro-ph.HE
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湍流磁场中相对论喷流的辐射

Radiation from relativistic jets in turbulent magnetic fields

K. -I. Nishikawa, M. Medvedev, B. Zhang, P. Hardee, J. Niemiec, A. Nordlund, J. Frederiksen, Y. Mizuno, H. Sol, G. J. Fishman

摘要:

使用我们的新的3-D相对论电磁粒子(REMP)与MPI并行代码,我们研究了长期粒子加速与相对论电子-正电子喷流在未磁化的环境电子-正电子等离子体中传播。模拟已经进行了使用一个更长的模拟系统比我们以前的模拟,以调查完整的非线性阶段的韦伯不稳定性和粒子加速机制。冷喷流电子被热化,周围的电子在由此产生的冲击中被加速。环境电子的加速导致最大环境电子密度比原始值大三倍。在射流激波中的弓形激波后面产生强电磁场。这些场可能导致余辉发射。我们计算了两个电子在均匀平行磁场中运动时的能谱随时间的演化,以验证这种方法。

英文摘要:

Using our new 3-D relativistic electromagnetic particle (REMP) code parallelized with MPI, we have investigated long-term particle acceleration associated with an relativistic electron-positron jet propagating in an unmagnetized ambient electron-positron plasma. The simulations have been performed using a much longer simulation system than our previous simulations in order to investigate the full nonlinear stage of the Weibel instability and its particle acceleration mechanism. Cold jet electrons are thermalized and ambient electrons are accelerated in the resulting shocks. The acceleration of ambient electrons leads to a maximum ambient electron density three times larger than the original value. Behind the bow shock in the jet shock strong electromagnetic fields are generated. These fields may lead to the afterglow emission. We have calculated the time evolution of the spectrum from two electrons propagating in a uniform parallel magnetic field to verify the technique.

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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