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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/29141
Title: Compact radio emission indicates a structured jet was produced by a binary neutron star merger
Authors: GHIRLANDA, Giancarlo 
Salafia, Om Sharan 
Paragi, Z.
Giroletti, M. 
Yang, J.
Marcote, B.
Blanchard, J.
Agudo, I.
An, T.
BERNARDINI, Maria Grazia 
Beswick, R.
Branchesi, M.
CAMPANA, Sergio 
Casadio, C.
Chassande-Mottin, E.
Colpi, M.
COVINO, Stefano 
D'AVANZO, Paolo 
D'Elia, V.
Frey, S.
Gawronski, M.
GHISELLINI, Gabriele 
Gurvits, L. I.
Jonker, P. G.
van Langevelde, H. J.
MELANDRI, Andrea 
Moldon, J.
Nava, L. 
Perego, A.
Perez-Torres, M. A.
Reynolds, C.
SALVATERRA, Ruben 
TAGLIAFERRI, Gianpiero 
VENTURI, Tiziana 
Vergani, S. D.
Zhang, M.
Issue Date: 2019
Journal: SCIENCE 
Number: 363
Issue: 6430
First Page: 968
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.
Note: Rassegna stamapa internazionale: Science Magazine (https://science.sciencemag.org/content/363/6430/968.editor-summary), EureKalert (https://www.eurekalert.org/pub_releases/2019-02/aaft-bns021919.php), Astroblogs (https://www.astroblogs.nl/2019/02/21/mondiaal-netwerk-van-radiotelescopen-ziet-nasleep-neutronensterbotsing/), SINC (https://www.agenciasinc.es/Noticias/El-chorro-de-material-que-surgio-por-la-fusion-de-dos-estrellas-de-neutrones), La Repubblica (https://www.repubblica.it/scienze/2019/02/21/news/materia_veloce_quasi_come_la_luce_dalla_sorgente_di_onde_gravitazionali-219746568/)
URI: http://hdl.handle.net/20.500.12386/29141
URL: https://science.sciencemag.org/content/363/6430/968
https://arxiv.org/abs/1808.00469
ISSN: 0036-8075
DOI: 10.1126/science.aau8815
Bibcode ADS: 2019Sci...363..968G
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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