来自GRB 160821A的时变偏振伽马射线：有序磁场的证据
高能天体物理现象
2019-09-11 v1
摘要
GRB 160821A是{\it Fermi}伽马射线空间望远镜观测到的第三大能量伽马射线暴。基于{\it AstroSat}上镉锌碲成像仪(CZTI)的观测，我们在此报告迄今最确凿的证据，表明(i)高线偏振(; 探测)，以及(ii)其偏振角在暴的上升和衰减阶段分别发生两次随时间变化，探测显著性为和。所有置信水平均针对两个感兴趣参数给出。这些观测强烈暗示由高度有序、角尺度为的磁场线中产生的同步辐射，其中为 outflow 的洛伦兹因子。
引用
@article{arxiv.1908.10885,
title = {Time varying polarized gamma-rays from GRB 160821A: evidence for ordered magnetic fields},
author = {Vidushi Sharma and Shabnam Iyyani and Dipankar Bhattacharya and Tanmoy Chattopadhyay and A. R. Rao and E. Aarthy and Santosh V. Vadawale and N. P. S. Mithun and Varun. B. Bhalerao and Felix Ryde and Asaf Peer},
journal= {arXiv preprint arXiv:1908.10885},
year = {2019}
}
备注
12 pages, 6 figures, accepted for publication in The Astrophysical Journal Letters