Imprints of superfluidity on magneto-elastic QPOs of SGRs

Ewald M\"uller; Jos\'e A. Font; Michael Gabler; Nikolaos Stergioulas; Pablo Cerd\'a-Dur\'an

Imprints of superfluidity on magneto-elastic QPOs of SGRs

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arxiv 1304.3566 v1 pith:LGDH2FEJ submitted 2013-04-12 astro-ph.HE gr-qc

Michael Gabler , Pablo Cerdá-Durán , Nikolaos Stergioulas , José A. Font , Ewald Müller This is my paper · ORCID

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keywords magneto-elasticqposfrequenciesobservedoscillationsrangesuperfluidagreement

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Our numerical simulations show that axisymmetric, torsional, magneto-elastic oscillations of magnetars with a superfluid core can explain the whole range of observed quasi-periodic oscillations (QPOs) in the giant flares of soft gamma-ray repeaters. There exist constant phase, magneto-elastic QPOs at both low (f<150 Hz) and high frequencies (f>500 Hz), in full 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 strongly suggest that neutrons in magnetar cores are superfluid.

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Zeeman effect in oscillations of magnetars with toroidal magnetic fields
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For a magnetar with a toroidal magnetic field confined to its crust, the paper derives the Zeeman-split magneto-elastic oscillation spectrum and gives simple formulas and fit constants for frequencies across stellar masses.

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