Journal
PHYSICAL REVIEW LETTERS
Volume 111, Issue 21, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.111.211102
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Funding
- Collaborative Research Center on Gravitational Wave Astronomy of the Deutsche Forschungsgemeinschaft (DFG SFB/Transregio 7)
- Spanish Ministerio de Educacion y Ciencia [AYA 2010-21097-C03-01]
- Generalitat Valenciana [PROMETEO-2009-103]
- ERC [CAMAP-259276]
- IKY-DAAD Exchange Grant
- CompStar, a Research Networking Programme of the European Science Foundation
- Excellence Grant for Basic Research (Research Committee of the Aristotle University of Thessaloniki)
- MNiSW [NN203511238]
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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 less than or similar 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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