Speaker
Mr
Onur Akbal
(Sabanci University)
Description
Standard glitches are characterized by a positive step in angular velocity and a negative step in the spin-down rate of the pulsar. There are no glitch-associated changes in the electromagnetic signature of rotation- powered pulsars in all cases so far. For the first time, in the last glitch of PSR J1119- 6127, there is clear evidence for changing emission properties coincident with the glitch. This glitch is also unusual in its signature. Further, the absolute value of the spin-down rate actually decreases in the long term. This is in contrast to usual glitch behaviour. In this paper we extend the vortex creep model in order to take into account these peculiarities. We propose that a starquake with crustal plate movement towards the rotational poles of the star induces inward vortex motion which causes the unusual glitch signature. The component of the magnetic field perpendicular to the rotation axis will decrease, giving rise to a permanent change in the pulsar external torque.
Primary author
Mr
Onur Akbal
(Sabanci University)
Co-author
Prof.
Mehmet Ali Alpar
(Sabanci University)
