Possibility of Ultra High-Energy Cosmic Rays from the Giant Flare in SGR 1806-20

Abstract

On 2004 December 27, a giant flare from the soft gamma repeater 1806$-$20 was observed. The radiation mechanism of the initial peak of the flare would be controversial. In this letter we point out that very high-energy cosmic rays would be produced in the case that the flare was caused by internal shocks, as is usually considered for gamma-ray bursts. The highest energy of cosmic rays can reach $10^{19}$ eV, if the Lorentz factor of the shocks is sufficiently high. Future observations of cosmic rays will inform us about the mechanism of the giant flare.

8 pages, 2figures

References in corpus (12)

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• Gamma-Ray Observations of a Giant Flare from The Magnetar SGR 1806-20
• An expanding radio nebula produced by a giant flare from the magnetar SGR 1806-20
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• Discovery of a Radio Source following the 27 December 2004 Giant Flare from SGR 1806-20
• A Re-brightening of the Radio Nebula associated with the 2004 December 27 giant flare from SGR 1806--20
• TeV-PeV Neutrinos from Giant Flares of Magnetars and the Case of SGR 1806-20
• The Growth, Polarization, and Motion of the Radio Afterglow from the Giant Flare from SGR 1806-20
• Cooling of Accelerated Nucleons and Neutrino Emission in Gamma-Ray Bursts
• An energetic blast wave from the December 27 giant flare of the soft gamma-ray repeater 1806-20
• Giant flare of SGR 1806-20 from a relativistic jet
• A Two-Component Explosion Model for the Giant Flare and Radio Afterglow from SGR1806-20

Cited by in corpus (5)

• The strongest cosmic magnets: Soft Gamma-ray Repeaters and Anomalous X-ray Pulsars
• Limits on the high-energy gamma and neutrino fluxes from the SGR 1806-20 giant flare of December 27th, 2004 with the AMANDA-II detector
• Diffuse high energy neutrinos and cosmic rays from hyperflares of soft-gamma repeaters
• The Giant Flare from SGR 1806-20 and its Radio Afterglow
• Unveiling the nature of the unidentified gamma-ray sources 4FGL J1908.6+0915e, HESS J1907+089/HOTS J1907+091, and 3HWC J1907+085 in the sky region of the magnetar SGR 1900+14