Séminaire de Physique ThéoriqueWhat can we learn from QPOs in magnetar flares?
Pablo Cerda-Duran (Universidad de Valencia, Espagne)
Thursday 16 October 2014 14:00 - Tours - Salle 1180 (Bât E2)
Soft gamma repeaters (SGRs) are believed to be strongly magnetized neutron stars (magnetars) showing frequent flare activity due to the rearrangement of the magnetic field and the cracking of the solid crust. In the x-ray tail of the three observed giant flares it has been observed the presence of quasi-periodic oscillations (QPOs), which may be related to oscillations of the neutron star interior. I will review the status of the modelling of such oscillations and present our latest numerical results regarding this scenario, including the presence of a solid crust and a superfluid core. Although current models give a plausible explanation for all observed QPOs, it is still a challenging task to impose constraints on neutron star properties based on current observations of magnetar QPOs.