Dynamics of a relativistic jet through magnetized media
Dynamics of a relativistic jet through magnetized media
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穿过磁化介质的相对论射流的动力学
DOI：
10.1093/mnras/stad023
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发表时间：
2023
影响因子：
4.8
通讯作者：
Lazzati, Davide
中科院分区：
文献类型：
--
作者：
García-García, Leonardo;López-Cámara, Diego;Lazzati, Davide
两颗中子星（NS）的合并产生了引力波的发射，形成了一个被密集和磁化环境包围的致密物体。如果双星发生延迟坍缩，可能会发射一个准直的相对论喷流，最终会产生一个短的伽马射线暴（SGRB）。喷流与环境的相互作用已被证明在塑造最终为伽马射线发射提供动力的外流结构方面发挥着重要作用。在本文中，我们提出了一套2.5D RMHD模拟，遵循相对论性非磁化射流通过具有不同磁化水平的介质的演变，作为合并后产生的两个NS。我们发现，磁化的环境介质的主要后果是，抑制射流内的不稳定性，并防止形成一系列的准直冲击。这意味着内部激波会失去效率，导致低光度的瞬发爆发。另一方面，射流头速度和射流内的感生磁化强度与周围介质的磁化强度相当无关。为了更好地理解磁化介质的作用，未来有必要进行更大范围的数值研究，以获得光变曲线和光谱。
The merger of two neutron stars (NSs) produces the emission of gravitational waves, the formation of a compact object surrounded by a dense and magnetized environment. If the binary undergoes delayed collapse a collimated and relativistic jet, which will eventually produce a short gamma-ray burst (SGRB), may be launched. The interaction of the jet with the environment has been shown to play a major role in shaping the structure of the outflow that eventually powers the gamma-ray emission. In this paper, we present a set of 2.5D RMHD simulations that follow the evolution of a relativistic non-magnetized jet through a medium with different magnetization levels, as produced after the merger of two NSs. We find that the predominant consequence of a magnetized ambient medium is that of suppressing instabilities within the jet and preventing the formation of a series of collimation shocks. One implication of this is that internal shocks lose efficiency, causing bursts with low-luminosity prompt emission. On the other hand, the jet-head velocity and the induced magnetization within the jet are fairly independent of the magnetization of the ambient medium. Future numerical studies with a larger domain are necessary to obtain light curves and spectra in order to better understand the role of magnetized media.