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http://hdl.handle.net/20.500.12386/30744
Titolo: | A year in the life of GW 170817: the rise and fall of a structured jet from a binary neutron star merger | Autori: | Troja, E. van Eerten, H. Ryan, G. Ricci, R. Burgess, J. M. Wieringa, M. H. PIRO, LUIGI Cenko, S. B. Sakamoto, T. |
Data pubblicazione: | 2019 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 489 | Fascicolo: | 2 | Da pagina:: | 1919 | Abstract: | We present the results of our year-long afterglow monitoring of GW 170817, the first binary neutron star merger detected by Advanced Laser Interferometer Gravitational-Wave Observatory (LIGO) and Advanced Virgo. New observations with the Australian Telescope Compact Array and the Chandra X-ray Telescope were used to constrain its late-time behaviour. The broad-band emission, from radio to X-rays, is well-described by a simple power-law spectrum with index β ∼ 0.585 at all epochs. After an initial shallow rise ∝t<SUP>0.9</SUP>, the afterglow displayed a smooth turnover, reaching a peak X-ray luminosity of L<SUB>X</SUB> ≈ 5 × 10<SUP>39</SUP> erg s<SUP>-1</SUP> at 160 d, and has now entered a phase of rapid decline, approximately ∝t<SUP>-2</SUP>. The latest temporal trend challenges most models of choked jet/cocoon systems, and is instead consistent with the emergence of a relativistic structured jet seen at an angle of ≈22° from its axis. Within such model, the properties of the explosion (such as its blast wave energy E<SUB>K</SUB> ≈ 2 × 10<SUP>50</SUP> erg, jet width θ<SUB>c</SUB> ≈ 4°, and ambient density n ≈ 3 × 10<SUP>-3</SUP> cm<SUP>-3</SUP>) fit well within the range of properties of cosmological short gamma-ray bursts. | URI: | http://hdl.handle.net/20.500.12386/30744 | URL: | https://academic.oup.com/mnras/article/489/2/1919/5549529 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stz2248 | Bibcode ADS: | 2019MNRAS.489.1919T | Fulltext: | open |
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