论文标题
中子星级合并GW170817中静光运动的光学测量
Optical measurement of superluminal motion in the neutron-star merger GW170817
论文作者
论文摘要
二进制中子星合并GW170817的余辉提供了结构化相对论喷射的证据，并在此类合并与短伽马射线爆发之间有联系。使用非常长的基线干涉仪（VLBI）发现的高光运动，以及余波光曲线在视角（14-28度），射流芯的开头（小于5度）以及对射流芯的初始Lorentz因子的限制（超过4）（超过4）（超过4）。在这里，我们以光速的七倍，利用哈勃太空望远镜精密天文学和以前的GW170817无线电VLBI数据来报告另一个静光运动测量。因此，我们获得了结构化射流机翼的Lorentz因子的独特测量，以及在视角（19-25度）和射流芯的初始Lorentz因子（超过40个）上的视角（19-25度）和最初的Lorentz因子。
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 about 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 of GW170817. We thereby obtain a unique 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).
