6533b85dfe1ef96bd12be87b
RESEARCH PRODUCT
Magneto-elastic torsional oscillations of magnetars
Ewald MüllerPablo Cerdá-duránJosé A. FontMichael GablerMichael GablerMichael GablerNikolaos Stergioulassubject
PhysicsHigh Energy Astrophysical Phenomena (astro-ph.HE)HistoryAstrophysics::High Energy Astrophysical PhenomenaEquatorFOS: Physical sciencesMagneto elasticAstrophysicsGeneral Relativity and Quantum Cosmology (gr-qc)MagnetarGeneral Relativity and Quantum CosmologyComputer Science ApplicationsEducationMagnetic fieldNeutron starDipoleAstrophysics - Solar and Stellar AstrophysicsTorsional oscillationsElasticity (economics)Astrophysics - High Energy Astrophysical PhenomenaSolar and Stellar Astrophysics (astro-ph.SR)description
We extend a general-relativistic ideal magneto-hydrodynamical code to include the effects of elasticity. Using this numerical tool we analyse the magneto-elastic oscillations of highly magnetised neutron stars (magnetars). In simulations without magnetic field we are able to recover the purely crustal shear oscillations within an accuracy of about a few per cent. For dipole magnetic fields between 5 x 10^13 and 10^15 G the Alfv\'en oscillations become modified substantially by the presence of the crust. Those quasi-periodic oscillations (QPOs) split into three families: Lower QPOs near the equator, Edge QPOs related to the last open field line and Upper QPOs at larger distance from the equator. Edge QPOs are called so because they are related to an edge in the corresponding Alfv\'en continuum. The Upper QPOs are of the same kind, while the Lower QPOs are turning-point QPOs, related to a turning point in the continuous spectrum.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2010-11-24 |