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http://hdl.handle.net/20.500.12386/30946
Titolo: | The outflow structure of GW170817 from late-time broad-band observations | Autori: | Troja, E. PIRO, LUIGI Ryan, G. van Eerten, H. RICCI, ROBERTO Wieringa, M. H. LOTTI, Simone Sakamoto, T. Cenko, S. B. |
Data pubblicazione: | 2018 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. LETTERS | Numero: | 478 | Fascicolo: | 1 | Da pagina:: | L18 | Abstract: | We present our broad-band study of GW170817 from radio to hard X-rays, including NuSTAR and Chandra observations up to 165 d after the merger, and a multimessenger analysis including LIGO constraints. The data are compared with predictions from a wide range of models, providing the first detailed comparison between non-trivial cocoon and jet models. Homogeneous and power-law shaped jets, as well as simple cocoon models are ruled out by the data, while both a Gaussian shaped jet and a cocoon with energy injection can describe the current data set for a reasonable range of physical parameters, consistent with the typical values derived from short GRB afterglows. We propose that these models can be unambiguously discriminated by future observations measuring the post-peak behaviour, with F<SUB>ν</SUB> ∝ t<SUP>∼-1.0</SUP> for the cocoon and F<SUB>ν</SUB>∝ t<SUP>∼-2.5</SUP> for the jet model. | URI: | http://hdl.handle.net/20.500.12386/30946 | URL: | http://arxiv.org/abs/1801.06516v2 https://academic.oup.com/mnrasl/article/478/1/L18/4969981 |
ISSN: | 1745-3925 | DOI: | 10.1093/mnrasl/sly061 | Bibcode ADS: | 2018MNRAS.478L..18T | Fulltext: | open |
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