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http://hdl.handle.net/20.500.12386/34814
Titolo: | Interpreting GRB170817A as a giant flare from a jet-less double neutron star merger | Autori: | Salafia, Om Sharan GHISELLINI, Gabriele GHIRLANDA, Giancarlo Colpi, M. |
Data pubblicazione: | 2018 | Rivista: | ASTRONOMY & ASTROPHYSICS | Numero: | 619 | Da pagina:: | A18 | Abstract: | We show that the delay between GRB170817A and GW170817 is incompatible with de-beamed emission from an off-axis relativistic jet. The prompt emission and the subsequent radio and X-ray observations can instead be interpreted within a giant-flare-like scenario, being the result of a relativistic outflow driven by the ultra-strong magnetic field produced by magnetohydrodynamic amplification during the merger of the progenitor double neutron-star binary. Within such a picture, the data indicate that the outflow must be endowed with a steep velocity profile, with a relatively fast tail extending to Γ ∼ 8. Since the conditions for the launch of such an outflow are relatively general, and the presence of a velocity profile is a natural expectation of the acceleration process, most neutron star binary mergers should feature this quasi-isotropic, hard X-ray emission component, that could be a powerful guide to the discovery of additional kilonovae associated to relatively nearby gravitational wave events. | URI: | http://hdl.handle.net/20.500.12386/34814 | URL: | https://arxiv.org/abs/1711.03112 https://www.aanda.org/articles/aa/full_html/2018/11/aa32259-17/aa32259-17.html |
ISSN: | 0004-6361 | DOI: | 10.1051/0004-6361/201732259 | Bibcode ADS: | 2018A&A...619A..18S | Fulltext: | open |
È visualizzato nelle collezioni: | 1.01 Articoli in rivista |
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