Magnetars' Giant Flares: the case of SGR 1806-20

Details Magnetars' Giant Flares: the case of SGR 1806-20 Magnetars' Giant Flares: the case of SGR 1806-20

2006-04-18

arxiv.org/abs/astro-ph/0604386v1

Astronomy and Astrophysics

Astrophysics

6 pages, 2 figures; accepted for publication in the Chinese Journal for Astronomy and Astrophysics (Vulcano conference - 2005)

Scientific paper

10.1088/1009-9271/6/S1/19

We first review on the peculiar characteristics of the bursting and flaring activity of the Soft Gamma-ray Repeaters and Anomalous X-ray Pulsars. We then report on the properties of the SGR 1806-20's Giant Flare occurred on 2004 December 27th, with particular interest on the pre and post flare intensity/hardness correlated variability. We show that these findings are consistent with the picture of a twisted internal magnetic field which stresses the star solid crust that finally cracks causing the giant flare (and the observed torsional oscillations). This crustal fracturing is accompanied by a simplification of the external magnetic field with a (partial) untwisting of the magnetosphere.

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