标题： 同步辐射光谱的伽马射线暴瞬时辐射和脉冲星风星云 显示英文标题

标题： Synchrotron spectra of GRB prompt emission and pulsar wind nebulae

摘要： 粒子加速是许多高能天体物理环境中的基本过程，并决定了其同步辐射光谱特征。我们研究了由磁流体动力学（MHD）湍流基本动力学引起的电子绝热随机加速（ASA），并发现ASA能够有效硬化注入的电子能量谱。在低能区ASA占主导地位，而在高能区同步辐射冷却占主导地位，导致电子能量谱和光子同步辐射谱均呈现分段幂律形状。此外，我们将ASA应用于研究伽马射线暴（GRBs）和脉冲星风云（PWNe）的瞬时发射同步辐射谱。我们的理论与观测结果之间的良好一致性证实了随机粒子加速在解释其同步辐射发射中的不可或缺性。 显示英文摘要

摘要： Particle acceleration is a fundamental process in many high-energy astrophysical environments and determines the spectral features of their synchrotron emission. We have studied the adiabatic stochastic acceleration (ASA) of electrons arising from the basic dynamics of magnetohydrodynamic (MHD) turbulence and found that the ASA acts to efficiently harden the injected electron energy spectrum. The dominance of the ASA at low energies and the dominance of synchrotron cooling at high energies result in a broken power-law shape of both electron energy spectrum and photon synchrotron spectrum. Furthermore, we have applied the ASA to studying the synchrotron spectra of the prompt emission of gamma-ray bursts (GRBs) and pulsar wind nebulae (PWNe). The good agreement between our theories and observations confirms that the stochastic particle acceleration is indispensable in explaining their synchrotron emission.