来自银河系磁星的毫秒级明亮射电暴
高能天体物理现象
2020-11-25 v2
摘要
磁星是高度磁化的年轻中子星，偶尔会产生巨大的 X 射线与伽马射线爆发和耀发。在银河系与麦哲伦云中目前已知的约三十颗磁星里，有五颗曾表现出瞬态射电脉冲。快速射电暴（FRBs）是来自宇宙学距离的毫秒级射电波爆发，其中部分已被观测到重复。重复 FRB 的一个主流模型认为它们是河外磁星，由其强磁场供能。然而，该模型面临的一个挑战是 FRB 的射电光度须比已知银河系磁星高出多个数量级。本文中，我们报告利用加拿大氢强度测绘实验（CHIME）FRB 项目探测到来自银河系磁星 SGR 1935+2154 的一次极强烈射电暴。该双分量明亮射电暴的流量密度与 SGR 1935+2154 的估计距离共同意味着其 400-800 MHz 暴能量约为 erg，比迄今任何射电发射磁星亮三个数量级。若此类暴来自邻近星系，将与典型 FRB 无法区分。因此，该事件弥合了银河系磁星群体与 FRB 之间射电能量差距的绝大部分，有力支持了磁星至少为部分 FRB 起源的观点。
引用
@article{arxiv.2005.10324,
title = {A bright millisecond-duration radio burst from a Galactic magnetar},
author = {FRB Collaboration and B. C. Andersen and K. M. Bandura and M. Bhardwaj and A. Bij and M. M. Boyce and P. J. Boyle and C. Brar and T. Cassanelli and P. Chawla and T. Chen and J. -F. Cliche and A. Cook and D. Cubranic and A. P. Curtin and N. T. Denman and M. Dobbs and F. Q. Dong and M. Fandino and E. Fonseca and B. M. Gaensler and U. Giri and D. C. Good and M. Halpern and A. S. Hill and G. F. Hinshaw and C. Höfer and A. Josephy and J. W. Kania and V. M. Kaspi and T. L. Landecker and C. Leung and D. Z. Li and H. -H. Lin and K. W. Masui and R. Mckinven and J. Mena-Parra and M. Merryfield and B. W. Meyers and D. Michilli and N. Milutinovic and A. Mirhosseini and M. Münchmeyer and A. Naidu and L. B. Newburgh and C. Ng and C. Patel and U. -L. Pen and T. Pinsonneault-Marotte and Z. Pleunis and B. M. Quine and M. Rafiei-Ravandi and M. Rahman and S. M. Ransom and A. Renard and P. Sanghavi and P. Scholz and J. R. Shaw and K. Shin and S. R. Siegel and S. Singh and R. J. Smegal and K. M. Smith and I. H. Stairs and C. M. Tan and S. P. Tendulkar and I. Tretyakov and K. Vanderlinde and H. Wang and D. Wulf and A. V. Zwaniga},
journal= {arXiv preprint arXiv:2005.10324},
year = {2020}
}
备注
Submitted to Nature. This version: Geocentric arrival time corrected