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Proton-synchrotron as the radiation mechanism of the prompt emission of gamma-ray bursts?

Journal
Date Issued
2020
Author(s)
•
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Oganesyan, G.
•
•
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Celotti, A.
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•
Ravasio, M. E.
•
Ronchi, M.
DOI
Abstract
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.
Volume
636
Start page
A82
Uri
Url
Issn Identifier
0004-6361
Ads BibCode
2020A&A...636A..82G
Rights
open.access
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