The Giant Flare from SGR 1806-20 and its Radio Afterglow

Details The Giant Flare from SGR 1806-20 and its Radio Afterglow The Giant Flare from SGR 1806-20 and its Radio Afterglow

2006-09-21

arxiv.org/abs/astro-ph/0609595v1

Mod.Phys.Lett. A21 (2006) 2171-2188

Astronomy and Astrophysics

Astrophysics

25 pages, 7 figures, accepted for publication in Modern Physics Letters A

Scientific paper

10.1142/S0217732306021645

The multi-wavelength observations of the 2004 December~27 Giant Flare (GF) from SGR 1806-20 and its long-lived radio afterglow are briefly reviewed. The GF appears to have been produced by a dramatic reconfiguration of the magnetic field near the surface of the neutron star, possibly accompanied by fractures in the crust. The explosive release of over 10^46 ergs (isotropic equivalent) powered a one-sided mildly relativistic outflow. The outflow produced a new expanding radio nebula, that is still visible over a year after the GF. Also considered are the constraints on the total energy in the GF, the energy and mass in the outflow, and on the external density, as well as possible implications for short gamma-ray bursts and potential signatures in high energy neutrinos, photons, or cosmic rays. Some possible future observations of this and other GFs are briefly discussed.

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