EM counterparts of structured jets from 3D GRMHD simulations
EM counterparts of structured jets from 3D GRMHD simulations
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DOI：
10.1093/mnrasl/slz012
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发表时间：
2018-09
影响因子：
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通讯作者：
A. Kathirgamaraju;A. Tchekhovskoy;D. Giannios;R. Barniol Duran-R.-Barniol Duran-2126751779
中科院分区：
文献类型：
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作者：
A. Kathirgamaraju;A. Tchekhovskoy;D. Giannios;R. Barniol Duran-R.-Barniol Duran-2126751779
GW 170817/GRB 170817 A为双中子星星合并后系统提供了前所未有的见解。即时和余辉发射光变曲线意味着存在一个紧密准直的相对论性喷流与平滑的横向结构。然而，目前还不清楚中央发动机是否以及如何产生这种结构化的喷气式飞机。在这里，我们利用3D GRMHD模拟开始与一个黑洞周围的磁化环面通常预期的合并后系统的属性。我们跟随喷流，因为它是自洽地从紧凑物体的尺度发射到超过3个数量级的距离。我们发现，这将导致在一个结构射流，这是由盘风准直成一个半开角约10 ^\circ $和其发射可以解释的即时发射和余辉光曲线的GRB 170817 A的功能。我们的模拟是第一个计算余辉，在一个二元合并的背景下，从一个相对论磁化射流自洽产生的吸积黑洞。由于喷流的横向结构是由吸积物理学决定的，而不是规定的，这就为中央发动机的物理学提供了一个严格的测试。
GW 170817/GRB 170817A has offered unprecedented insight into binary neutron star post-merger systems. Prompt and afterglow emission light curves imply the presence of a tightly collimated relativistic jet with a smooth transverse structure. However, it remains unclear whether and how the central engine can produce such structured jets. Here, we utilize 3D GRMHD simulations starting with a black hole surrounded by a magnetized torus with properties typically expected of a post merger system. We follow the jet as it is self-consistently launched from the scale of the compact object out to more than 3 orders of magnitude in distance. We find that this results in a structured jet, which is collimated by the disk wind into a half-opening angle of roughly $10^\circ$ and whose emission can both explain the features of the prompt emission and afterglow light curves of GRB 170817A. Our simulation is the first to compute the afterglow, in the context of a binary merger, from a relativistic magnetized jet self-consistently generated by an accreting black hole. With the jet's transverse structure determined by the accretion physics rather than prescribed, this offers a stringent test of the physics of the central engine.