The radio nebula produced by the 27 December 2004 giant flare from SGR 1806-20

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Scientific paper

On 27 December 2004, just the third giant flare was observed from a magnetar, in this case SGR 1806-20. This giant flare was the most energetic of the three, and analysis of a Very Large Array observation of SGR 1806-20 after the giant flare revealed the existence of a new, bright, transient radio source at its position. Follow-up radio observations of this source determined that initially, this source underwent a mildly relativistic one-sided expansion which ceased at the same time as a temporary rebrightening of the radio source. These observational results imply that the radio emission is powered by ˜1024 g of baryonic material which was ejected off the surface on the neutron star during the giant flare.

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