论文标题
GRB迅速发射与各向异性电子分布
GRB Prompt Emission with Anisotropic Electron Distribution
论文作者
论文摘要
伽马射线爆发（GRB）迅速发射的典型光谱表明，尽管标准同步加速器模型中具有强磁场，但电子冷却仍被抑制。最近的细胞中粒子模拟表明，磁重新连接在磁性主导的等离子体中加速的粒子加速会导致小螺距角，尤其是在低能区域。如此小的音高角度可防止电子通过同步加速器辐射冷却。在本文中，考虑到同步加速器冷却和绝热冷却的效果，我们用各向异性电子分布来数值计算同步子光谱。 If we require a Poynting flux larger than $10^{50}~\mbox{erg}~\mbox{s}^{-1}$ as the model is motivated by magnetic reconnection, the bulk Lorentz factor of $\sim 1000$ and the electron minimum Lorentz factor of $γ_{\rm min}\sim 10^4$ are required to reproduce the典型的GRB光谱。
The typical spectrum of the prompt emission of gamma-ray bursts (GRBs) indicates that the electron cooling is suppressed in spite of the strong magnetic field in the standard synchrotron model. Recent Particle-in-Cell simulations show that the particle acceleration by magnetic reconnection in a magnetically dominated plasma can lead to small pitch angles especially in low-energy region. Such a small pitch angle prevents electrons from cooling via synchrotron radiation. In this paper, taking into account the effects of the synchrotron cooling and the adiabatic cooling, we numerically calculate the synchrotron spectra with anisotropic electron distributions. If we require a Poynting flux larger than $10^{50}~\mbox{erg}~\mbox{s}^{-1}$ as the model is motivated by magnetic reconnection, the bulk Lorentz factor of $\sim 1000$ and the electron minimum Lorentz factor of $γ_{\rm min}\sim 10^4$ are required to reproduce the typical GRB spectrum.
