arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 0906.4483astro-ph.HE
收藏

被周围介质减速的相对论喷射物的对流不稳定性:伽玛暴中磁场的起源?

Convective Instability of a Relativistic Ejecta Decelerated by a Surrounding Medium: An Origin of Magnetic Fields in GRBs?

Amir Levinson

摘要:

对描述相对论性壳体在环境介质作用下减速的自相似解进行了全局线性稳定性分析。该系统被证明是受对流瑞利-泰勒不稳定性,具有角尺度远小于因果关系尺度的本征模的快速增长。增长率似乎是最大的界面分离的冲击喷出物和冲击环境气体。接触界面处产生的扰动在冲击介质中传播,引起正、反向冲击波阵面的非线性振荡。推测这种振荡可能影响伽玛暴早期余辉阶段冲击喷出物的辐射,并可能是冲击环爆介质中磁场的来源。

英文摘要:

Global linear stability analysis of a self-similar solution describing a relativistic shell decelerated by an ambient medium is performed. The system is shown to be subject to the convective Rayleigh-Taylor instability, with a rapid growth of eigenmodes having angular scale much smaller than the causality scale. The growth rate appears to be largest at the interface separating the shocked ejecta and shocked ambient gas. The disturbances produced at the contact interface propagate in the shocked media and cause nonlinear oscillations of the forward and reverse shock fronts. It is speculated that such oscillations may affect the emission from the shocked ejecta in the early afterglow phase of GRBs, and may be the origin of the magnetic field in the shocked circum-burst medium.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑