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15 - Glitches, Timing Noise, Nudot Switching

from Part III - Neutron Star Physics

Published online by Cambridge University Press:  21 July 2022

Andrew Lyne
Affiliation:
University of Manchester
Francis Graham-Smith
Affiliation:
University of Manchester
Benjamin Stappers
Affiliation:
University of Manchester
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Summary

The characteristic steps in the rotation rates of pulsars are known as glitches and arise in the irregular transfer of angular momentum from the interior to the crust as a neutron star spins down. They are related to the structure and the fluid dynamics of some superfluid components. The angular momentum is quantised in vortices, which may be pinned to the crystal structure of the crust. Glitches may be related to catastrophic unpinning events and to cracking of the crust itself. Timing noise is quasi-random variation in rotation rate. In many pulsars, the spin-down rate is seen to switch abruptly as the emission changes, indicating that changes in magnetospheric particle flows are responsible for both spin-down and radiation.

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Pulsar Astronomy , pp. 235 - 257
Publisher: Cambridge University Press
Print publication year: 2022

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