Wideband timing of the Parkes Pulsar Timing Array UWL data by Małgorzata Curyło et al. on Thursday 24 November

In 2018 an ultra-wide-bandwidth low-frequency (UWL) receiver was installed on

the 64-m Parkes Radio Telescope enabling observations with an instantaneous

frequency coverage from 704 to 4032 MHz. Here, we present the analysis of a

three-year data set of 35 millisecond pulsars observed with the UWL by the

Parkes Pulsar Timing Array (PPTA), using wideband timing methods. The two key

differences compared to typical narrow-band methods are, firstly, generation of

two-dimensional templates accounting for pulse shape evolution with frequency

and, secondly, simultaneous measurements of the pulse time-of-arrival (ToA) and

dispersion measure (DM). This is the first time that wideband timing has been

applied to a uniform data set collected with a single large-fractional

bandwidth receiver, for which such techniques were originally developed. As a

result of our study, we present a set of profile evolution models and new

timing solutions including initial noise analysis. Precision of our ToA and DM

measurements is in the range of 0.005 $-$ 2.08 $\mu$s and

(0.043$-$14.24)$\times10^{-4}$ cm$^{-3}$ pc, respectively, with 94% of the

pulsars achieving a median ToA uncertainty of less than 1 $\mu$s.

arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2211.12924v1