论文标题
用离轴伽玛射线爆发余滴探测跨偏见冲击的粒子加速度
Probing particle acceleration at trans-relativistic shocks with off-axis gamma-ray burst afterglows
论文作者
论文摘要
预计粒子加速度在相对论和非权利性无碰撞冲击之间会有所不同。我们表明，电磁与重力波（GWS），伽马射线爆发（GRB）余气是观察加速电子分布的跨偏生主义演变的理想目标，因为GWS附近的GWS Spots GRBS附近的GRBS射线量具有离轴Jets，否则在Gamma-Ray射线观察中却错过了。我们发现，相对论的光谱斜率在光曲线的峰值时间附近开始陡峭地变化，并在峰值时间的10倍内接近非相关限制。余辉同步子谱的跨偏置演化与错误内的GRB 170817A观测值一致，并且在浓密环境中的GW Horizon $ \ sim 200 $ MPC中可以在类似但更遥远的事件中进行测量。我们粗略地估计，此类事件代表了GRB 170817A的10-50％的近距离短GRB的比例。我们还发现，如果光曲线彼此相似，光谱演化并不取决于射流结构。
Particle acceleration is expected to be different between relativistic and non-relativistic collisionless shocks. We show that electromagnetic counterparts to gravitational waves (GWs), gamma-ray burst (GRB) afterglows, are ideal targets for observing trans-relativistic evolution of accelerated electron distribution because the GWs spot nearby GRBs with off-axis jets, otherwise missed in gamma-ray observations. We find that the relativistic spectral slope begins to change steeply near the peak time of the light curve and approaches the non-relativistic limit in about 10 times the peak time. The trans-relativistic evolution of the afterglow synchrotron spectrum is consistent with GRB 170817A observations within errors, and will be measurable in similar but more distant events at a GW horizon $\sim 200$ Mpc in a denser environment. We roughly estimate that such events represent a fraction of 10-50 per cent of the GRB 170817A-like off-axis short GRBs. We also find that the spectral evolution does not depend on the jet structure if their light curves are similar to each other.
