The UTMOST pulsar timing programme - II

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 1.0-4.8yr 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 (d{nu}/dt), 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^|d{nu}/dt|^b^, where a=-0.84^+0.47^-0.49 and b=0.97^+0.16^-0.19. This method can be easily adapted to utilize 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.

Cone search capability for table J/MNRAS/494/228/tablea1 (Astrometric and rotational parameters of all pulsars analysed in this work)

Related Identifier
Related Identifier
Metadata Access
Creator Lower M.E.; Bailes M.; Shannon R.M.; Johnston S.; Flynn C.; Oslowski S.,Gupta V.; Farah W.; Bateman T.; Green A.J.; Hunstead R.; Jameson A.,Jankowski F.; Parthasarathy A.; Price D.C.; Sutherland A.; Temby D.,Venkatraman Krishnan V.
Publisher CDS
Publication Year 2023
OpenAccess true
Contact CDS support team <cds-question(at)>
Resource Type Dataset; AstroObjects
Discipline Astrophysical Processes; Astrophysics and Astronomy; Cosmology; Natural Sciences; Observational Astronomy; Physics; Stellar Astronomy