Imprints of superfluidity on magneto-elastic QPOs of SGRs
Michael Gabler, Pablo Cerd\'a-Dur\'an, Nikolaos Stergioulas, Jos\'e A., Font, Ewald M\"uller
TL;DR
This paper demonstrates through numerical simulations that superfluidity in magnetar cores influences magneto-elastic oscillations, successfully explaining observed QPOs in SGRs and supporting the presence of superfluid neutrons.
Contribution
It provides the first comprehensive simulation-based explanation for the entire observed QPO spectrum in SGRs, highlighting the role of superfluidity in magnetar cores.
Findings
Superfluid core oscillations match observed QPO frequencies.
Magnetic field strengths align with spin-down estimates.
Superfluidity is strongly supported by the results.
Abstract
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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