论文标题
从紧凑的恒星合并中检测GEV余辉的费米 - 拉特检测
Fermi-LAT Detection of a GeV Afterglow from a Compact Stellar Merger
论文作者
论文摘要
通常认为长期伽玛射线爆发（GRB）与大量的恒星核心崩溃有关，而短期grbs与紧凑的恒星二进制合并有关。然而，发现与附近（350 MPC）长期GRB-GRB 211211a相关的Kilonova，这表明该长期GRB的祖先是紧凑的对象合并。在这里，我们报告了伽马射线（$> 100 {\ rm \ mev} $）的Fermi-LAT检测，GRB 211211a的余滴发射持续$ \ sim $ \ sim $ \ sim $ \ sim $ 20,000 s，这是传统短期GRB的最长事件。我们建议这种伽马射线的发射来自余旋同步加速器的发射。 GEV排放的软谱可能是由于有限的最大同步器能量仅为几百个MEV，$ \ sim $ 20,000 s。 GEV发射的持续时间异常长，可能是由于该GRB的接近性以及在低密度Circumburst培养基中膨胀的GRB射流的长度减速时间，这与紧凑的恒星合并方案一致。
It is usually thought that long-duration gamma-ray bursts (GRBs) are associated with massive star core collapse, whereas short-duration GRBs are associated with mergers of compact stellar binaries. The discovery of a kilonova associated with a nearby (350 Mpc) long-duration GRB-GRB 211211A, however, indicates that the progenitor of this long-duration GRB is a compact object merger. Here we report the Fermi-LAT detection of gamma-ray ($>100 {\rm \ MeV}$) afterglow emission from GRB 211211A, which lasts $\sim$20,000 s after the burst, the longest event for conventional short-duration GRBs ever detected. We suggest that this gamma-ray emission results from afterglow synchrotron emission. The soft spectrum of GeV emission may arise from a limited maximum synchrotron energy of only a few hundreds of MeV at $\sim$20,000 s. The unusually long duration of the GeV emission could be due to the proximity of this GRB and the long deceleration time of the GRB jet that is expanding in a low-density circumburst medium, consistent with the compact stellar merger scenario.
