A polarization census of bright pulsars using the Ultra-Wideband Receiver on the Parkes radio telescope

We present high signal-to-noise, full polarization pulse profiles for 40 bright, 'slowly'-rotating (non-recycled) pulsars using the new Ultra-Wideband Low-frequency (UWL; 704-4032 MHz) receiver on the Parkes radio telescope. We obtain updated and accurate interstellar medium parameters towards these pulsars (dispersion measures and Faraday rotation measures), and reveal Faraday dispersion towards PSR J1721--3532 that is caused by interstellar scattering. We find general trends including decreasing fractional linear polarization and increasing degree of circular polarization with increasing frequency, consistent with previous studies, while also revealing new features and frequency evolution. This demonstrates results that can be obtained using UWL monitoring observations of slow pulsars, which are valuable for improving our understanding of pulsar emission and the intervening interstellar medium. The calibrated data products are publicly available. Here we provide: the final data product for each of the 40 pulsars (i.e., flux- and polarization-calibrated, time-averaged, DM- and RM-corrected, full-polarization Parkes UWL data in PSRFITS format); and their pulse profile templates (also in PSRFITS format) created using Parkes 20-cm Multibeam data presented in Johnston, S. & Kerr, M., 2018, Monthly Notices of the Royal Astronomical Society, Volume 474, Issue 4, p.4629-4636.