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Timing of young radio pulsars - I. Timing noise, periodic modulation, and proper motion

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posted on 2024-08-06, 12:04 authored by A. Parthasarathy, Ryan ShannonRyan Shannon, S. Johnston, L. Lentati, Matthew BailesMatthew Bailes, S. Dai, M. Kerr, R. N. Manchester, Stefan Oslowski, C. Sobey, Willem van Straten, P. Weltevrede
The smooth spin-down of young pulsars is perturbed by two non-deterministic phenomenon, glitches, and timing noise. Although the timing noise provides insights into nuclear and plasma physics at extreme densities, it acts as a barrier to high-precision pulsar timing experiments. An improved methodology based on the Bayesian inference is developed to simultaneously model the stochastic and deterministic parameters for a sample of 85 high-(E) over dot radio pulsars observed for similar to 10 yr with the 64-m Parkes radio telescope. Timing noise is known to be a red process and we develop a parametrization based on the red-noise amplitude ((Ared)) and spectral index (beta). We measure the median Ared to be -10.4(-1.7)(+1.8) yr(3/2) and ss to be -5.2(-3.8)(+3.0) and show that the strength of timing noise scales proportionally to nu(1)vertical bar(nu) over dot vertical bar(-0.6 +/- 0.1), where. is the spin frequency of the pulsar and.. is its spin-down rate. Finally, we measure significant braking indices for 19 pulsars and proper motions for 2 pulsars, and discuss the presence of periodic modulation in the arrival times of 5 pulsars.

Funding

ARC Centre of Excellence for Gravitational Wave Discovery

Australian Research Council

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Exascale astronomy: real-time analysis of the transient radio universe

Australian Research Council

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ISSN

1365-2966

Journal title

Monthly Notices of the Royal Astronomical Society

Volume

489

Issue

3

Pagination

16 pp

Publisher

Oxford University Press (OUP)

Copyright statement

This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

Language

eng

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