6533b7d1fe1ef96bd125c32e
RESEARCH PRODUCT
Imprints of superfluidity on magnetoelastic quasiperiodic oscillations of soft gamma-ray repeaters.
Nikolaos StergioulasPablo Cerdá-duránEwald MüllerMichael GablerJosé A. Fontsubject
PhysicsQuantum fluid010308 nuclear & particles physicsAstrophysics::High Energy Astrophysical PhenomenaGamma rayGeneral Physics and AstronomyAstrophysicsMagnetar01 natural sciencesMagnetic fieldSuperfluidityNeutron starQuasiperiodic functionExcited state0103 physical sciences010303 astronomy & astrophysicsdescription
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 $f\ensuremath{\lesssim}150\text{ }\text{ }\mathrm{Hz}$ and resonantly excited high-frequency QPOs ($fg500\text{ }\text{ }\mathrm{Hz}$), 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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2013-04-12 | Physical review letters |