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An expanding radio nebula produced by a giant flare from the magnetar SGR 1806-20 | B M Gaensler
; C Kouveliotou
; J D Gelf
; G B Taylor
; D Eichler
; R A M J Wijers
; J Granot
; E Ramirez-Ruiz
; Y E Lyubarsky
; R W Hunstead
; D Campbell-Wilson
; A J van der Horst
; M A McLaughlin
; R P Fender
; M A Garrett
; K J Newton-McGee
; D M Palmer
; N Gehrels
; P M Woods
; | Date: |
28 Apr 2005 | Journal: | Nature, 434 (7037), 1104-6 | Abstract: | Soft gamma-ray repeaters (SGRs) are ’magnetars’, a small class of slowly spinning neutron stars with extreme surface magnetic fields, B approximately 10(15) gauss (refs 1 , 2 -3). On 27 December 2004, a giant flare was detected from the magnetar SGR 1806-20 (ref. 2), only the third such event recorded. This burst of energy was detected by a variety of instruments and even caused an ionospheric disturbance in the Earth’s upper atmosphere that was recorded around the globe. Here we report the detection of a fading radio afterglow produced by this outburst, with a luminosity 500 times larger than the only other detection of a similar source. From day 6 to day 19 after the flare from SGR 1806-20, a resolved, linearly polarized, radio nebula was seen, expanding at approximately a quarter of the speed of light. To create this nebula, at least 4 x 10(43) ergs of energy must have been emitted by the giant flare in the form of magnetic fields and relativistic particles. | Source: | PubMed, pmid15858566 doi: 10.1038/nature03498 | Services: | Forum | Review | Favorites |
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