演講資訊

摘要：

Magnetars are neutron stars whose photospheric luminosities exceed their spin-down luminosities. They possess magnetic fields of order 10^15 G, whose energy can power their various activities. Magnetars produce X-ray bursting activities and are also considered strong candidates for the origin of fast radio bursts (FRBs). Although many observational results have been obtained, many aspects of magnetar bursts remain unclear, such as the triggers of bursts, the emission mechanisms of FRBs, and the possible existence of other associated signals.
In this talk, I will present our recent studies of magnetar bursting activities. First, I will introduce a novel scenario for triggering bursts. In this scenario, we apply the Dzhanibekov effect to magnetars and propose that it may trigger their bursting activities. Second, I will examine the X-ray properties of the short burst associated with the Galactic FRB in 2020. Our numerical simulations show that the observed X-ray spectrum and the energetics of both X-ray and FRBs can be naturally explained within an outflowing fireball model. Through radiative acceleration in a strong magnetic field, an ultra-relativistic outflow can be generated, which can supply the energy required for the FRB. I will also highlight additional aspects of magnetar bursts discussed in our recent works, including their potential connection to ultra-high-energy cosmic rays, high-energy neutrinos, MeV line emission, and X-ray polarization. These results provide new perspectives on the physical origins and multi-messenger signatures of magnetar bursting activity.