1. The outflow structure of GW170817 from late-time broad-band observations.
- Author
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Troja, E, Piro, L, Ryan, G, van Eerten, H, Ricci, R, Wieringa, M H, Lotti, S, Sakamoto, T, and Cenko, S B
- Subjects
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HARD X-rays , *GAUSSIAN processes , *ASTRONOMICAL observations , *JETS (Nuclear physics) - Abstract
We present our broad-band study of GW170817 from radio to hard X-rays, including
NuSTAR andChandra 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, withF ν ∝t ∼−1.0 for the cocoon andFν ∝t ∼−2.5 for the jet model. [ABSTRACT FROM AUTHOR]- Published
- 2018
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