Peculiar glitch of PSR J1119-6127 and extension of the vortex creep model

Akbal, Onur and Gügercinoğlu, Erbil and Şaşmaz Muş, Sinem and Alpar, M. Ali (2015) Peculiar glitch of PSR J1119-6127 and extension of the vortex creep model. Monthly Notices of the Royal Astronomical Society, 449 (1). pp. 933-941. ISSN 0035-8711 (Print) 1365-2966 (Online)

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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 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.
Item Type: Article
Uncontrolled Keywords: stars: interiors; stars: magnetic field; stars: neutron; pulsars: general; pulsars: individual: PSR J 1119-6127
Subjects: Q Science > QB Astronomy > QB460-466 Astrophysics
Divisions: Faculty of Engineering and Natural Sciences > Basic Sciences > Physics
Faculty of Engineering and Natural Sciences
Depositing User: M. Ali Alpar
Date Deposited: 14 Dec 2015 14:47
Last Modified: 23 Aug 2019 15:51

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