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- W4309758610 abstract "The close correlation observed between emission state and spin-down rate change of pulsars has many implications both for the magnetospheric physics and the neutron star interior. The middle-aged pulsar PSR J0738$-$4042, which had been observed to display variations in the pulse profile associated with its spin-down rate change due to external effects, is a remarkable example. In this study, based on the 12.5-yr combined public timing data from UTMOST and Parkes, we have detected a new emission-rotation correlation in PSR J0738$-$4042 concurrent with a glitch. A glitch that occurred at MJD 57359(5) (December 3, 2015) with $Deltanu/nu sim 0.36(4)times 10^{-9}$ is the first glitch event observed in this pulsar and is probably the underlying cause of the emission-rotation correlation. Unlike the usual post-glitch behaviours, the braking torque on the pulsar has continued to increase over 1380 d, corresponding to a significant decrease in $ddot{nu}$. As for changes in the pulse profile after the glitch, the relative amplitude of the leading component weakens drastically, while the middle component becomes stronger. A combined model of crustquake induced platelet movement and vortex creep response is invoked to account for this rare correlation. In this scenario, magnetospheric state-change is naturally linked to the pulsar-intrinsic processes that give rise to a glitch." @default.
- W4309758610 created "2022-11-29" @default.
- W4309758610 creator A5002919928 @default.
- W4309758610 creator A5005441647 @default.
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- W4309758610 creator A5076109216 @default.
- W4309758610 creator A5079444629 @default.
- W4309758610 date "2022-11-21" @default.
- W4309758610 modified "2023-10-18" @default.
- W4309758610 title "New pulse profile variability associated with a glitch of PSR J0738-4042" @default.
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