标题： 伽马射线暴中相对论磁重联加速粒子的观测证据 显示英文标题

标题： Observational Evidence of Particles Acceleration by Relativistic Magnetic Reconnection in Gamma-ray Bursts

摘要： 伽马射线暴（GRBs）作为现代宇宙中最剧烈的爆炸现象，已经被研究了半个多世纪，但导致其观测到的光谱行为的粒子加速和辐射物理仍未被很好地理解。 基于对明亮伽马射线暴 GRB 160625B 和 GRB 160509A 脉冲性质的综合分析，我们首次发现了由相对论磁重联引起的粒子加速证据，这些证据来自两个光谱拐点（$E_{\rm p}$和$E_{\rm cut}$）的演化行为。 同时，在磁重联区域发射粒子的绝热冷却过程产生了光谱指数与流量之间的关系。 我们还讨论了光谱能量相关性的背后物理机制。 最后，我们认为发现$E_{\rm cut}$和$L_{\rm iso}$之间的反相关性可能为诊断各种天体物理源中的粒子加速和辐射物理开辟了一条新途径。 显示英文摘要

摘要： Gamma-ray bursts (GRBs) as the most energetic explosions in the modern universe have been studied over half a century, but the physics of the particle acceleration and radiation responsible for their observed spectral behaviors are still not well understood. Based on the comprehensive analysis of the pulse properties in both bright GRB~160625B and GRB~160509A, for the first time, we identify evidences of particle acceleration by relativistic magnetic reconnection from the evolutionary behavior of the two spectral breaks ($E_{\rm p}$ and $E_{\rm cut}$). Meanwhile, the adiabatic cooling process of the emitting particles in the magnetic reconnection regions produces a relation between the spectral index and the flux. We also discuss the physics behind spectral energy correlations. Finally, we argue that the identification of an anticorrelation between $E_{\rm cut}$ and $L_{\rm iso}$ may opens a new avenue for diagnostics of the physics of the particle acceleration and radiation in a variety of astrophysical sources.