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Optical superluminal motion measurement in the neutron-star merger GW170817
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Optical superluminal motion measurement in the neutron-star merger GW170817
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Journal Article
Optical superluminal motion measurement in the neutron-star merger GW170817
2022
Overview
The afterglow of the binary neutron-star merger GW170817
1
gave evidence for a structured relativistic jet
2
–
6
and a link
3
,
7
,
8
between such mergers and short gamma-ray bursts. Superluminal motion, found using radio very long baseline interferometry
3
(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).
Optical superluminal motion in the binary neutron-star merger GW170817 is used to constrain the speed and morphology of the structured jet, and improve constraints on the inclination angle of the merging binary system.
Publisher
Nature Publishing Group UK,Nature Publishing Group
Subject
