Two years of pulsar observations with the Ultra-Wideband Receiver on the Parkes radio telescope

TL;DR

This paper reports two years of pulsar observations using the ultra-wideband receiver on the Parkes telescope, revealing variability in dispersion and rotation measures, flux densities, and discovering pulsars with nulling and mode changing behaviors.

Contribution

First detailed two-year observational study with the ultra-wideband system on the Parkes telescope, providing high-precision measurements and new pulsar variability insights.

Findings

DM and RM variability observed over time with high precision

Discovery of pulsars exhibiting nulling and mode changing

Identification of pulsars with extreme RM values

Abstract

The major programme for observing young, non-recycled pulsars with the Parkes telescope has transitioned from a narrow-band system to an ultra-wideband system capable of observing between 704 and 4032 MHz. We report here on the initial two years of observations with this receiver. Results include dispersion measure (DM) and Faraday rotation measure (RM) variability with time, determined with higher precision than hitherto, flux density measurements and the discovery of several nulling and mode changing pulsars. PSR J1703-4851 is shown to be one of a small subclass of pulsars that has a weak and a strong mode which alternate rapidly in time. PSR J1114-6100 has the fourth highest |RM| of any known pulsar despite its location far from the Galactic Centre. PSR J1825-1446 shows variations in both DM and RM likely due to its motion behind a foreground supernova remnant.