论文标题
伽马射线爆发的风力和余星的动力和排放：耀斑，高原和陡峭的衰变
Dynamics and emission of wind-powered afterglows of gamma-ray bursts: flares, plateaus and steep decays
论文作者
论文摘要
我们开发了一种X射线余星的模型，该模型是由逆冲击（RS）通过长期持久的中央发动机产生的超相对性的，高度磁性的脉冲星样风的反向冲击（RS）的模型。我们首先对相对论双爆炸的流体和MHD数值模拟。我们证明，即使对于风的恒定特性，也可以产生各种时间行为，具体取决于初始爆炸的能量和风能的能量，风的开关延迟时间以及风的磁化。高度磁化RS的X射线发射发生在快速冷却方案中 - 这确保了高辐射效率并允许快速强度变化。我们证明：（i）rs发射自然会产生光曲线，显示具有各种时间指数的幂律时间演变； （ii）$ \ sim 10^{46} $ erg s $^{ - 1} $的轻度风能（等效的同型）可以重现Afterglows的高原阶段； （iii）终止风会产生突然的陡峭衰减； （iv）短期余辉耀斑是由于风光度的轻度变化，总注射能量较小。
We develop a model of early X-ray afterglows of gamma-ray bursts originating from the reverse shock (RS) propagating through ultra-relativistic, highly magnetized pulsar-like winds produced by long-lasting central engines. We first perform fluid and MHD numerical simulations of relativistic double explosions. We demonstrate that even for constant properties of the wind a variety of temporal behaviors can be produced, depending on the energy of the initial explosion and the wind power, the delay time for the switch-on of the wind, and magnetization of the wind. X-ray emission of the highly magnetized RS occurs in the fast cooling regime - this ensures high radiative efficiency and allows fast intensity variations. We demonstrate that: (i) RS emission naturally produces light curves showing power-law temporal evolution with various temporal indices; (ii) mild wind power, of the order of $\sim 10^{46}$ erg s$^{-1}$ (equivalent isotropic), can reproduce the afterglows' plateau phase; (iii) termination of the wind can produce sudden steep decays; (iv) short-duration afterglow flares are due to mild variations in the wind luminosity, with small total injected energy.
