论文标题
短伽马射线爆发中的反向冲击 - GRB 160821B的情况和前景作为重力波的案例
Reverse Shocks in Short Gamma-Ray Bursts -- The case of GRB 160821B and prospects as gravitational-wave counterparts
论文作者
论文摘要
产生余辉到GRB的冲击系统由向前和反击组成。对于短的GRB，反击的观察性证据很少，但是，GRB 160821b的余辉需要在早期时期进行反击才能解释无线电观察结果。 GRB 160821b还伴随着最佳采样的Macronova，没有重力波检测，并具有有趣的后期X射线余辉行为，指示刷新震动。在轴上短的GRB中观察到的反震的存在意味着应将反冲击视为引力波检测到的合并的潜在对应物。作为引力波对应物，余波到离轴GRB射流可以揭示射流结构 - 这些结构化的射流系统中将存在反击，如果观察到这些反冲动的签名，可以指示流出中的磁化程度。在这里，我们显示了GRB 160821b的案例，以及对轴心观察者的反击将如何出现到结构化射流。
The shock system that produces the afterglow to GRBs consists of a forward- and a reverse-shock. For short GRBs, observational evidence for a reverse-shock has been sparse, however, the afterglow to GRB 160821B requires a reverse-shock at early times to explain the radio observations. GRB 160821B is additionally accompanied by the best-sampled macronova without a gravitational-wave detection, and an interesting late-time X-ray afterglow behaviour indicative of a refreshed-shock. The presence of an observed reverse-shock in an on-axis short GRB means that the reverse-shock should be considered as a potential counterpart to gravitational-wave detected mergers. As a gravitational-wave counterpart, the afterglow to an off-axis GRB jet can reveal the jet structure -- a reverse-shock will exist in these structured jet systems and the signature of these reverse-shocks, if observed, can indicate the degree of magnetisation in the outflow. Here we show the case of GRB 160821B, and how a reverse-shock will appear for an off-axis observer to a structured jet.
