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http://hdl.handle.net/20.500.12386/31747
Titolo: | Proton-synchrotron as the radiation mechanism of the prompt emission of gamma-ray bursts? | Autori: | GHISELLINI, Gabriele GHIRLANDA, Giancarlo Oganesyan, G. ASCENZI, STEFANO Nava, Lara Celotti, A. Salafia, Om Sharan Ravasio, M. E. Ronchi, M. |
Data pubblicazione: | 2020 | Rivista: | ASTRONOMY & ASTROPHYSICS | Numero: | 636 | Da pagina:: | A82 | 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 F<SUB>ν</SUB> ∝ ν<SUP>1/3</SUP> shape followed by F<SUB>ν</SUB> ∝ ν<SUP>-1/2</SUP> 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. | URI: | http://hdl.handle.net/20.500.12386/31747 | URL: | https://www.aanda.org/articles/aa/full_html/2020/04/aa37244-19/aa37244-19.html http://arxiv.org/abs/1912.02185v2 |
ISSN: | 0004-6361 | DOI: | 10.1051/0004-6361/201937244 | Bibcode ADS: | 2020A&A...636A..82G | Fulltext: | open |
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