Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 494, Issue 2, Pages 2012-2026Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/staa882
Keywords
methods: data analysis; stars: neutron; pulsars: general
Categories
Funding
- Swinburne
- Australian Government Education Investment Fund
- National Collaborative Research Infrastructure Strategy (NCRIS)
- Australian Research Council (ARC) Centre of Excellence [CE170100004]
- CSIRO Astronomy and Space Science
- ARC [CE170100004, FL150100148]
- NASA
- STFC [ST/T000414/1] Funding Source: UKRI
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In Paper I of this series, we detected a significant value of the braking index (n) for 19 young, high-E radio pulsars using similar to 10 yr of timing observations from the 64-m Parkes radio telescope. Here, we investigate this result in more detail using a Bayesian pulsar timing framework to model timing noise and to perform selection to distinguish between models containing exponential glitch recovery and braking index signatures. We show that consistent values of n are maintained with the addition of substantial archival data, even in the presence of glitches. We provide strong arguments that our measurements are unlikely due to exponential recovery signals from unseen glitches even though glitches play a key role in the evolution of a pulsar's spin frequency. We conclude that, at least over decadal time-scales, the value of n can be significantly larger than the canonical 3 and discuss the implications for the evolution of pulsars.
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