致密射电辐射表明双中子星并合产生了结构化喷流
高能天体物理现象
2019-02-26 v2
摘要
双中子星并合事件GW170817同时通过电磁辐射和引力波被探测到。其余辉辐射可能由窄相对论性喷流或各向同性外流产生。对源大小和位移的高空间分辨率测量可以区分这些场景。我们展示了在并合后207.4天使用由32台射电望远镜组成的全球网络进行的甚长基线干涉测量（Very Long Baseline Interferometry, VLBI）观测。在90%置信水平上，视源大小被约束为小于2.5毫角秒。这排除了会产生更大视大小的各向同性外流场景，表明GW170817产生了一个结构化的相对论性喷流。我们的速率计算表明，至少10%的中子星并合会产生这样的喷流。
引用
@article{arxiv.1808.00469,
title = {Compact radio emission indicates a structured jet was produced by a binary neutron star merger},
author = {G. Ghirlanda and O. S. Salafia and Z. Paragi and M. Giroletti and J. Yang and B. Marcote and J. Blanchard and I. Agudo and T. An and M. G. Bernardini and R. Beswick and M. Branchesi and S. Campana and C. Casadio and E. Chassande-Mottin and M. Colpi and S. Covino and P. D'Avanzo and V. D'Elia and S. Frey and M. Gawronski and G. Ghisellini and L. I. Gurvits and P. G. Jonker and H. J. van Langevelde and A. Melandri and J. Moldon and L. Nava and A. Perego and M. A. Perez-Torres and C. Reynolds and R. Salvaterra and G. Tagliaferri and T. Venturi and S. D. Vergani and M. Zhang},
journal= {arXiv preprint arXiv:1808.00469},
year = {2019}
}
备注
28 pages, 10 figures, 2 tables. This is the author's version of the work. It is posted here by permission of the AAAS for personal use, not for redistribution. The definitive version was published in Science , (2019-02-21), doi: 10.1126/science.aau8815