The binary neutron star merger event GW170817 was detected through both electromagnetic radiation and gravitational waves. Its afterglow emission may have been produced by either a narrow relativistic jet or an isotropic outflow. High-spatial-resolution measurements of the source size and displacement can discriminate between these scenarios.We present very-long-baseline interferometry observations, performed 207.4 days after the merger by using a global network of 32 radio telescopes. The apparent source size is constrained to be smaller than 2.5 milli–arc seconds at the 90% confidence level. This excludes the isotropic outflow scenario, which would have produced a larger apparent size, indicating that GW170817 produced a structured relativistic jet. Our rate calculations show that at least 10% of neutron star mergers produce such a jet.
Compact radio emission indicates a structured jet was produced by a binary neutron star merger / Ghirlanda, G.; Salafia, O. S.; Paragi, Z.; Giroletti, M.; Yang, J.; Marcote, B.; Blanchard, J.; Agudo, I.; An, T.; Bernardini, M. G.; Beswick, R.; Branchesi, M.; Campana, S.; Casadio, C.; Chassande-Mottin, E.; Colpi, M.; Covino, S.; D'Avanzo, P.; D'Elia, V.; Frey, S.; Gawronski, M.; Ghisellini, G.; Gurvits, L. I.; Jonker, P. G.; van Langevelde, H. J.; Melandri, A.; Moldon, J.; Nava, L.; Perego, A.; Perez-Torres, M. A.; Reynolds, C.; Salvaterra, R.; Tagliaferri, G.; Venturi, T.; Vergani, S. D.; Zhang, M.. - In: SCIENCE. - ISSN 1095-9203. - 363:6430(2019), pp. 968-971. [10.1126/science.aau8815]
Compact radio emission indicates a structured jet was produced by a binary neutron star merger
Perego, A.;
2019-01-01
Abstract
The binary neutron star merger event GW170817 was detected through both electromagnetic radiation and gravitational waves. Its afterglow emission may have been produced by either a narrow relativistic jet or an isotropic outflow. High-spatial-resolution measurements of the source size and displacement can discriminate between these scenarios.We present very-long-baseline interferometry observations, performed 207.4 days after the merger by using a global network of 32 radio telescopes. The apparent source size is constrained to be smaller than 2.5 milli–arc seconds at the 90% confidence level. This excludes the isotropic outflow scenario, which would have produced a larger apparent size, indicating that GW170817 produced a structured relativistic jet. Our rate calculations show that at least 10% of neutron star mergers produce such a jet.| File | Dimensione | Formato | |
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