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Imprints of superfluidity on magnetoelastic quasiperiodic oscillations of soft gamma-ray repeaters
Michael Gabler1, Pablo Cerdá-Durán, Nikolaos Stergioulas
1Departamento de Astronomía y Astrofísica, Universitat de València, 46100 Burjassot, Valencia, Spain and Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Strasse 1, 85741 Garching, Germany.
Abstract:
Our numerical simulations show that axisymmetric, torsional, magnetoelastic oscillations of magnetars with a superfluid core can explain the whole range of observed quasiperiodic oscillations (QPOs) in the giant flares of soft gamma-ray repeaters. There exist constant phase QPOs at f is < or approximately equal to 150 Hz and resonantly excited high-frequency QPOs (f>500 Hz), in good agreement with observations. The range of magnetic field strengths required to match the observed QPO frequencies agrees with that from spin-down estimates. These results suggest that there is at least one superfluid species in magnetar cores.
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