Implications of the radio and X-ray emission that followed GW170817

@article{Nakar2018ImplicationsOT,
  title={Implications of the radio and X-ray emission that followed GW170817},
  author={Ehud Nakar and Tsvi Piran},
  journal={Monthly Notices of the Royal Astronomical Society},
  year={2018},
  volume={478},
  pages={407-415}
}
  • E. NakarT. Piran
  • Published 29 January 2018
  • Physics
  • Monthly Notices of the Royal Astronomical Society
The radio and X-rays that followed GW170817 increased gradually over $\sim~100$ days, resembling the radio flare predicted to arise from the interaction of a binary neutron star merger outflow with the ISM \citep{nakar2011}. Considering a blast wave moving with a Lorentz factor $\Gamma$, we show that an off-axis observer, namely an observer at $\theta_{obs}>1/\Gamma$, sees a light curve rising faster than $F_\nu\propto t^3$. Therefore, the observed rise, $F_\nu\propto~t^{0.78}$, implies that at… 

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