The UTMOST pulsar timing programme II: Timing noise across the pulsar population

Abstract

While pulsars possess exceptional rotational stability, large scale timing studies have revealed at least two distinct types of irregularities in their rotation: red timing noise and glitches. Using modern Bayesian techniques, we investigated the timing noise properties of 300 bright southern-sky radio pulsars that have been observed over 1.0-4.8 years by the upgraded Molonglo Observatory Synthesis Telescope (MOST). We reanalysed the spin and spin-down changes associated with nine previously reported pulsar glitches, report the discovery of three new glitches and four unusual glitch-like events in the rotational evolution of PSR J1825$-$0935. We develop a refined Bayesian framework for determining how red noise strength scales with pulsar spin frequency ($\nu$) and spin-down frequency ($\dot{\nu }$), which we apply to a sample of 280 non-recycled pulsars. With this new method and a simple power-law scaling relation, we show that red noise strength scales across the non-recycled pulsar population as ${\nu }^a|\dot{\nu }{|}^b$, where $a=-0.84_{-0.49}^{+0.47}$ and $b=0.97_{-0.19}^{+0.16}$. This method can be easily adapted to utilise more complex, astrophysically motivated red noise models. Lastly, we highlight our timing of the double neutron star PSR J0737$-$3039, and the rediscovery of a bright radio pulsar originally found during the first Molonglo pulsar surveys with an incorrectly catalogued position.

Accepted by MNRAS. 28 pages, 8 figures, 8 tables

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Cited by in corpus (20)

• The Third Fermi Large Area Telescope Catalog of Gamma-ray Pulsars
• The impact of glitches on young pulsar rotational evolution
• Stellar Mass-to-light Ratios: Composite Bulge+Disk Models and the Baryonic Tully-Fisher Relation
• Pulsar glitch detection with a hidden Markov model
• A polarization census of bright pulsars using the Ultra-Wideband Receiver on the Parkes radio telescope
• A magnetar parallax
• Parameter estimation of a two-component neutron star model with spin wandering
• Rapid parameter estimation of a two-component neutron star model with spin wandering using a Kalman filter
• Systematic upper limits on the size of missing pulsar glitches in the first UTMOST open data release
• An updated glitch rate law inferred from radio pulsars
• A new small glitch in Vela discovered with a hidden Markov model
• Apparent dispersion in pulsar braking index measurements caused by timing noise
• Rotational and radio emission properties of PSR J0738-4042 over half a century
• Pulse Frequency Fluctuations of Persistent Accretion Powered Pulsars
• Long-term statistics of pulsar glitches due to history-dependent avalanches
• Constraints on wide-band radiative changes after a glitch in PSR J1452-6036
• Searches for Continuous Gravitational Waves from Supernova Remnants in the first part of the LIGO-Virgo-KAGRA Fourth Observing run
• Hierarchical Bayesian estimation of population-level torque law parameters from anomalous pulsar braking indices
• Measuring the crust-superfluid coupling time-scale for 105 UTMOST pulsars with a Kalman filter
• Long-term rotational and emission variability of 17 radio pulsars