Speaker
Dr
Michael Gabler
(MPA Garching)
Description
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 $f\lesssim150$\,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.
Author
Dr
Michael Gabler
(MPA Garching)
