التفاصيل البيبلوغرافية
| العنوان: |
The Short GRB 170817A: Modeling the Off-axis Emission and Implications on the Ejecta Magnetization. |
| المؤلفون: |
N. Fraija, F. De Colle, P. Veres, S. Dichiara, R. Barniol Duran, A. Galvan-Gamez, A. C. Caligula do E. S. Pedreira |
| المصدر: |
Astrophysical Journal; 1/20/2019, Vol. 871 Issue 1, p1-1, 1p |
| مصطلحات موضوعية: |
STELLAR mergers, GAMMA ray bursts, NEUTRON stars, LIGHT curves, BINARY stars, TELESCOPES, MAGNETIZATION |
| مستخلص: |
The short GRB 170817A, detected by the Fermi Gamma-ray Burst Monitor, orbiting satellites and ground-based telescopes, was the electromagnetic counterpart of a gravitational-wave transient (GW170817) from a binary neutron star merger. After this merger, the γ-ray light curve exhibited a faint peak at ∼1.7 s and the X-ray, optical, and radio light curves displayed extended emission that increased in brightness up to ∼160 days. In this paper, we show that the X-ray, optical and radio fluxes are consistent with the synchrotron forward-shock model viewed off-axis when the matter in the outflow is parameterized through a power-law velocity distribution. We discuss the origin of the γ-ray peak in terms of internal and external shocks. We show that the γ-ray flux might be consistent with a synchrotron self-Compton reverse-shock model observed at high latitudes. Comparing the best-fit values obtained after describing the γ-ray, X-ray, optical, and radio fluxes with our model, we find that the afterglow and γ-ray emission occurred in different regions and also find evidence to propose that the progenitor environment was entrained with magnetic fields; therefore we argue for the presence of magnetic field amplification in the binary neutron star merger. [ABSTRACT FROM AUTHOR] |
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