Proton-synchrotron as the radiation mechanism of the prompt emission of gamma-ray bursts?
| Autor: | S. Ascenzi, Gabriele Ghisellini, Om Sharan Salafia, Lara Nava, M. E. Ravasio, Gor Oganesyan, Giancarlo Ghirlanda, Annalisa Celotti, M. Ronchi |
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| Přispěvatelé: | Ghisellini, G, Ghirlanda, G, Oganesyan, G, Ascenzi, S, Nava, L, Celotti, A, Salafia, O, Ravasio, M, Ronchi, M, ITA |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Physics
Radiation mechanisms: non-thermal 010308 nuclear & particles physics Scattering Astrophysics::High Energy Astrophysical Phenomena Synchrotron radiation Proton Synchrotron Gamma-ray burst: general Astronomy and Astrophysics Astrophysics Radiation 01 natural sciences Synchrotron law.invention Magnetic field Settore FIS/05 - Astronomia e Astrofisica Space and Planetary Science law 0103 physical sciences Particle Gamma-ray burst 010303 astronomy & astrophysics Gamma-rays: general |
| Popis: | We discuss the new surprising observational results that indicate quite convincingly that the prompt emission of gamma-ray bursts (GRBs) is due to synchrotron radiation produced by a particle distribution that has a low-energy cut-off. The evidence of this is provided by the low-energy part of the spectrum of the prompt emission, which shows the characteristic Fν ∝ ν1/3 shape followed by Fν ∝ ν−1/2 up to the peak frequency. This implies that although the emitting particles are in fast cooling, they do not cool completely. This poses a severe challenge to the basic ideas about how and where the emission is produced, because the incomplete cooling requires a small value of the magnetic field to limit synchrotron cooling, and a large emitting region to limit the self-Compton cooling, even considering Klein–Nishina scattering effects. Some new and fundamental ingredient is required for understanding the GRBs prompt emission. We propose proton–synchrotron as a promising mechanism to solve the incomplete cooling puzzle. |
| Databáze: | OpenAIRE |
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