Fast Radio Burst Trains from Magnetar Oscillations

Understand

Quasi-periodic oscillations inferred during rare magnetar giant flare tails were initially interpreted as torsional oscillations of the neutron star (NS) crust, and have been more recently described as global core+crust perturbations.

• Similar frequencies are also present in high signal-to-noise magnetar short bursts.
• In magnetars, disturbances of the field are strongly coupled to the NS crust regardless of the triggering mechanism of short bursts.
• For low-altitude magnetospheric magnetar models of fast radio bursts (FRBs) associated with magnetar short bursts, such as the low-twist model, crustal oscillations may be associated with additional radio bursts in the encompassing short burst event (as recently suggested for SGR 1935+2154).