Bromberg 2007 伽玛暴喷流极束的流体力学分析

主要内容:
baryon poor jet (BPJ)，但周围介质密度高一些，起到约束喷流准直的作用。

精彩摘抄:


文章信息:
arXiv:0705.2040 [ps, pdf, other] : Title: Hydrodynamic Collimation of Relativistic Outflows: Semianalytic Solutions and Application to Gamma-Ray Bursts
Authors: Omer Bromberg , Amir Levinson
Comments: 22 pages, 7 figures

A model is developed for the confinement and collimation of a baryon poor outflow by its surrounding medium. Both, confinement by kinetic pressure of a static corona, and confinement by the ram pressure of a supersonic wind emanating from a disk surrounding the inner source are considered. Solutions are presented for the structure of the shocked layers of deflected baryon poor jet (BPJ) and exterior wind. The dependence of the opening angle of the BPJ on the parameters of the confining medium are carefully examined. It is found that the BPJ shock may either converge to the symmetry axis or diverge away from it, depending on the opening angle of the BPJ injection cone. In the latter case the inner flow exhibits a non-uniform structure, consisting of an ultra-relativistic core containing the unshocked BPJ enveloped by the slower, shocked BPJ layer. The implications of our results to the prompt GRB emission are briefly discussed.