Статья

The outflow structure of GW170817 from late-time broad-band observations

E. TrojaAstrophysics Science Division, NASA Goddard Space Flight Center, 8800 Greenbelt Road, Greenbelt, MD 20771, USAL. PiroINAF, Istituto di Astrofisica e Planetologia Spaziali, via Fosso del Cavaliere 100, I-00133 Rome, ItalyGeoffrey RyanDepartment of Astronomy, University of Maryland, College Park, MD 20742-4111, USAHendrik van EertenDepartment of Physics, University of Bath, Claverton Down, Bath BA2 7AY, UKR. RicciINAF-Istituto di Radioastronomia, Via Gobetti 101, Bologna, I-40129, ItalyM. H. WieringaCSIRO Astronomy and Space Science, PO Box 76, Epping, NSW 1710, AustraliaSimone LottiINAF, Istituto di Astrofisica e Planetologia Spaziali, via Fosso del Cavaliere 100, I-00133 Rome, ItalyT. SakamotoAoyama Gakuin University, 5-10-1 Fuchinobe, Chuoku, Sagamiharashi, Kanagawa 252-5258, JapanS. B. CenkoAstrophysics Science Division, NASA Goddard Space Flight Center, 8800 Greenbelt Road, Greenbelt, MD 20771, USA

2018en

ABI

Аннотация

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 Fν ∝ t∼−1.0 for the cocoon and Fν∝ t∼−2.5 for the jet model.

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Идентификаторы

DOI: 10.1093/mnrasl/sly061

Цитирования и источники

Цитирований: 3Использованных источников: 0

Показатели — AkademScholar