Particle Emission-dependent Timing Noise of Pulsars?

TL;DR

This paper investigates how fluctuations in particle emission from pulsars contribute to timing noise, showing that such variations can produce observable effects consistent with real pulsar data over years.

Contribution

It introduces a model linking particle emission fluctuations to pulsar timing noise, highlighting the impact of fluctuation periods on noise strength.

Findings

Particle emission fluctuations cause measurable timing noise.

Longer fluctuation periods lead to stronger timing noise.

Simulated noise matches observed pulsar timing behaviors.

Abstract

Though pulsars spin regularly, the differences between the observed and predicted ToA (time of arrival), known as "timing noise", can still reach a few milliseconds or more. We try to understand the noise in this paper. As proposed by Xu & Qiao in 2001, both dipole radiation and particle emission would result in pulsar braking. Accordingly, possible fluctuation of particle current flow is suggested here to contribute significant ToA variation of pulsars. We find that the particle emission fluctuation could lead to timing noise which can't be eliminated in timing process, and that a longer period fluctuation would arouse a stronger noise. The simulated timing noise profile and amplitude are in accord with the observed timing behaviors on the timescale of years.