Reconciling observed gamma-ray burst prompt spectra with synchrotron radiation?
F. DaigneInstitut d’Astrophysique de Paris, UMR 7095 Université Pierre et Marie Curie – CNRS, 98bis boulevard Arago, 75014 Paris, FranceŽ. BošnjakAIM (UMR 7158 CEA/DSM-CNRS-Université Paris Diderot) Irfu/Service d’Astrophysique, Saclay, 91191 Gif-sur-Yvette Cedex, FranceG. DubusInstitut d’Astrophysique de Paris, UMR 7095 Université Pierre et Marie Curie – CNRS, 98bis boulevard Arago, 75014 Paris, France
2010en
ABI
Аннотация
Context. Gamma-ray burst emission in the prompt phase is often interpreted as synchrotron radiation from high-energy electrons accelerated in internal shocks. Fast synchrotron cooling of a power-law distribution of electrons leads to the prediction that the slope below the spectral peak has a photon index α = −3/2 (N(E) ∝ Eα). However, this differs significantly from the observed median value α ≈ −1. This discrepancy has been used to argue against this scenario.
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