Peculiar Glitch of PSR J1119-6127 and Extension of the Vortex Creep Model

Abstract

Glitches are sudden changes in rotation frequency and spin-down rate, observed from pulsars of all ages. Standard glitches are characterized by a positive step in angular velocity ($\Delta \Omega$ $>$ $0$) and a negative step in the spin-down rate ($\Delta \dot{\Omega }$ $<$ $0$) 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.

accepted by MNRAS, 10 pages, 2 figures

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Cited by in corpus (10)

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• Superfluidity and Superconductivity in Neutron Stars
• Magnetar-like X-ray Bursts from a Rotation Powered Pulsar, PSR J1119-6127
• Global numerical simulations of the rise of vortex-mediated pulsar glitches in full general relativity
• Discovery of a Glitch in the Accretion Powered Pulsar SXP 1062
• Neutron star dynamics under time dependent external torques
• Minimum Glitch of the Crab Pulsar and the Crustquake as a Trigger Mechanism
• On the evolution of high-B radio pulsars with measured braking indices
• Coherent radio emission from a twisted magnetosphere after magnetar-quake
• Neutron Star Dynamics under Time Dependent External Torques