Expanding fireball in magnetar bursts and fast radio bursts
Expanding fireball in magnetar bursts and fast radio bursts
复制标题
磁星爆发和快速射电暴中膨胀的火球
DOI：
10.1093/mnras/stac3681
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发表时间：
2022
影响因子：
4.8
通讯作者：
Ioka Kunihito
中科院分区：
文献类型：
--
作者：
Wada Tomoki;Ioka Kunihito
中子星星（NS）表面附近产生的辐射等离子体火球在自身压力下沿沿着磁力线膨胀，并产生光子发射和相对论物质外流。我们将膨胀火球演化综合分为五种情况，并在考虑关键过程的情况下获得光球亮度和外流动能;从磁通量管逃逸的光子的横向扩散、强磁场的影响、来自NS表面的重子加载以及通过回旋共振散射的辐射加速，其中一些还没有在伽马射线爆发的背景下考虑过。将我们的模型应用于磁星爆发与快速射电爆发（FRB），特别是与银河系FRB 20200428 A相关的SGR 1935+2154的X射线短爆发，我们表明爆发辐射可以加速外流到高洛伦兹因子，并具有足够的能量为FRB提供动力。
A fireball of radiation plasma created near the surface of a neutron star (NS) expands under its own pressure along magnetic field lines, and produces photon emission and relativistic matter outflow. We comprehensively classify the expanding fireball evolution into five cases, and obtain the photospheric luminosity and the kinetic energy of the outflow, taking into account key processes; lateral diffusion of photons escaping from a magnetic flux tube, effects of strong magnetic field, baryon loading from the NS surface, and radiative acceleration via cyclotron resonant scattering, some of which have not been considered in the context of gamma-ray bursts. Applying our model to magnetar bursts with fast radio bursts (FRBs), in particular the X-ray short bursts from SGR 1935+2154 associated with the Galactic FRB 20200428A, we show that the burst radiation can accelerate the outflow to high-Lorentz factor with sufficient energy to power FRBs.