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 ∼ 10 24 g of baryonic material which was ejected off the surface on the neutron star during the giant flare.
- Pulsars: general
- Pulsars: individual SGR 1806-20
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science