Timing Noise in Pulsars and Magnetars and the Magnetospheric Moment of Inertia

Abstract

We examine timing noise in both magnetars and regular pulsars, and find that there exists a component of the timing noise with strong magnetic field dependence above B ~ 10^{12.5} G. The dependence of the timing noise floor on the magnetic field is also reflected in the smallest observable glitch size. We find that magnetospheric torque variation cannot explain this component of timing noise. We calculate the moment of inertia of the magnetic field outside of a neutron star and show that this timing noise component may be due to variation of this moment of inertia, and could be evidence of rapid global magnetospheric variability.

5 pages, 3 figures, accepted by ApJL

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• Magnetic Field Evolution in Neutron Star Crusts: Beyond the Hall Effect
• Current closure through the neutron star crust
• Strongly magnetized pulsars: explosive events and evolution
• Pulse Frequency Fluctuations of Magnetars
• On the Diversity of Compact Objects within Supernova Remnants II: Energy Loss Mechanisms
• Refinement of the timing-based estimator of pulsar magnetic fields
• Pulse Frequency Fluctuations of Persistent Accretion Powered Pulsars
• Interlinking internal and external magnetic fields of relativistically rotating neutron stars
• Magnetic Field Evolution in the Crust of Neutron Stars: Crust Failure and Plastic Flow
• Explanation of the exceptionally strong timing noise of PSR J0337+1715 by a circum-ternary planet and consequences for gravity tests