Optical superluminal motion measurement in the neutron-star merger GW170817
Optical superluminal motion measurement in the neutron-star merger GW170817
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DOI：
10.1038/s41586-022-05145-7
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发表时间：
2022-10
期刊：
影响因子：
64.8
通讯作者：
K. Mooley;Jay Anderson;Wenbin Lu
中科院分区：
文献类型：
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作者：
K. Mooley;Jay Anderson;Wenbin Lu
中子星合并双星GW 170817的余辉提供了结构相对论喷流的证据，以及这种合并和短伽马射线爆发之间的联系。使用射电甚长基线干涉测量法（VLBI）发现的超光速运动，以及余辉光变曲线提供了对视角（14-28度）、喷流核心张开角（小于5度）和喷流核心初始洛伦兹因子（大于4）的适度限制的限制。在这里，我们报告另一个超光速运动测量，在七倍的光速，利用哈勃太空望远镜精密天体测量和以前的无线电VLBI数据GW 170817。因此，我们获得了结构化射流的机翼的洛伦兹因子的测量，以及对视角（19-25度）和射流核心的初始洛伦兹因子（大于40）的显著改进的约束。
The afterglow of the binary neutron-star merger GW170817 gave evidence for a structured relativistic jet, , , –and a link,,between such mergers and short gamma-ray bursts. Superluminal motion, found using radio very long baseline interferometry (VLBI), together with the afterglow light curve provided constraints on the viewing angle (14–28 degrees), the opening angle of the jet core (less than 5 degrees) and a modest limit on the initial Lorentz factor of the jet core (more than 4). Here we report on another superluminal motion measurement, at seven times the speed of light, leveraging Hubble Space Telescope precision astrometry and previous radio VLBI data for GW170817. We thereby obtain a measurement of the Lorentz factor of the wing of the structured jet, as well as substantially improved constraints on the viewing angle (19–25 degrees) and the initial Lorentz factor of the jet core (more than 40).