The delay time of gravitational wave - gamma-ray burst associations

被引：47

作者：

Zhang, Bing ^{[1
]}

机构：

[1] Univ Nevada, Dept Phys & Astron, Las Vegas, NV 89154 USA

来源：

FRONTIERS OF PHYSICS | 2019年 / 14卷 / 06期

关键词：

gravitational waves; gamma-ray bursts: general; BLACK-HOLE; CENTRAL ENGINE; EMISSION; GRB; VARIABILITY; SIGNATURE; DURATION; EVOLUTION; RADIATION; AFTERGLOW;

D O I：

10.1007/s11467-019-0913-4

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The first gravitational wave (GW) - gamma-ray burst (GRB) association, GW170817/GRB 170817A, had an offset in time, with the GRB trigger time delayed by similar to 1.7 s with respect to the merger time of the GW signal. We generally discuss the astrophysical origin of the delay time, Delta t, of GW-GRB associations within the context of compact binary coalescence (CBC) - short GRB (sGRB) associations and GW burst - long GRB (lGRB) associations. In general, the delay time should include three terms, the time to launch a clean (relativistic) jet, Delta t(jet); the time for the jet to break out from the surrounding medium, Delta t(bo); and the time for the jet to reach the energy dissipation and GRB emission site, Delta t(GRB). For CBC-sGRB associations, Delta t(jet) and Delta t(bo) are correlated, and the final delay can be from 10 ms to a few seconds. For GWB-lGRB associations, Delta t(jet) and Delta t(bo) are independent. The latter is at least similar to 10 s, so that Delta t of these associations is at least this long. For certain jet launching mechanisms of lGRBs, Delta t can be minutes or even hours long due to the extended engine waiting time to launch a jet. We discuss the cases of GW170817/GRB 170817A and GW150914/GW150914-GBM within this theoretical framework and suggest that the delay times of future GW/GRB associations will shed light into the jet launching mechanisms of GRBs.

引用

页数：11

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