Measuring the crust-superfluid coupling time-scale for 105 UTMOST pulsars with a Kalman filter

Abstract

Crust-superfluid coupling plays an important role in neutron star rotation, particularly with respect to timing noise and glitches. Here, we present new timing-noise-based estimates of the crust-superfluid coupling time-scale for 105 radio pulsars in the UTMOST data set, by Kalman filtering the pulse times of arrival. The 105 objects are selected because they favour a two-component crust-superfluid model over a one-component model with log Bayes factor. The median estimate of ranges from s for PSR J2241-5236 to s for PSR J1644-4559 among 28 out of 105 objects with sharply peaked posteriors. A hierarchical Bayesian analysis is performed on 101 out of 105 objects that are canonical (i.e. neith..