Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-05-12
Astrophys.J. 628 (2005) L53-L56
Astronomy and Astrophysics
Astrophysics
Accepted for publication on ApJ Letters. 4 Pages, 3 figures. emulateapj5 style used
Scientific paper
10.1086/432615
We have discovered rapid Quasi Periodic Oscillations (QPOs) in RXTE/PCA measurements of the pulsating tail of the 27th December 2004 giant flare of SGR 1806-20. QPOs at about 92.5Hz are detected in a 50s interval starting 170s after the onset of the giant flare. These QPOs appear to be associated with increased emission by a relatively hard unpulsed component and are seen only over phases of the 7.56s spin period pulsations away from the main peak. QPOs at about 18 and 30Hz are also detected, 200-300s after the onset of the giant flare. This is the first time that QPOs are unambiguously detected in the flux of a Soft Gamma-ray Repeater, or any other magnetar candidate. We interpret the highest QPOs in terms of the coupling of toroidal seismic modes with Alfven waves propagating along magnetospheric field lines. The lowest frequency QPO might instead provide indirect evidence on the strength of the internal magnetic field of the neutron star.
Belloni Tomaso
Casella Pier Giorgio
Dall'Osso Simone
Gruber Duane
Israel GianLuca
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