On Hadronic Models for the Anomalous $γ$-ray Emission Component in GRB 941017

Details On Hadronic Models for the Anomalous $γ$-ray Emission Component in GRB 941017 On Hadronic Models for the Anomalous $γ$-ray Emission Component in GRB 941017

2003-12-09

arxiv.org/abs/astro-ph/0312251v1

Astronomy and Astrophysics

Astrophysics

5 pages, 1 figure, in 2003 Santa Fe Conference on GRBs

Scientific paper

10.1063/1.1810907

Gonz\'alez et al. (2003) have reported the discovery of an anomalous radiation component from ~ 1 -- 200 MeV in GRB 941017. This component varies independently of and contains >~ 3 times the energy found in the prompt ~ 50 keV -- 1 MeV radiation component that is well described by the relativistic synchrotron-shock model. Acceleration of hadrons to very high energies by GRBs could give rise to a separate emission component. Two models, both involving acceleration of ultra-high energy cosmic rays with subsequent photomeson interactions, are considered. The first involves a pair-photon cascade initiated by photohadronic processes in the GRB blast wave. Calculations indicate that the cascade produces a spectrum that is too soft to explain the observations. A second model is proposed where photopion interactions in the GRB blast-wave shell give rise to an escaping collimated neutron beam. The outflowing neutrons undergo further photopion interactions to produce a beam of hyper-relativistic electrons that can lose most of their energy during a fraction of a gyroperiod in the Gauss-strength magnetic fields found in the circumburst medium. This secondary electron beam produces a hard synchrotron radiation spectrum that could explain the anomalous component in GRB 941017.

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