Ultra-wide Bandwidth Observations of 19 pulsars with Parkes telescope

TL;DR

This paper presents the first flux density measurements, spectral indices, and polarization profiles for 19 pulsars using the Parkes telescope's ultra-wideband receiver, enhancing pulsar spectral data.

Contribution

It provides new flux density and spectral index data for 19 pulsars, including polarization profiles, using the UWL receiver system, filling gaps in pulsar spectral observations.

Findings

Spectral indices range from -0.6 to -3.10 for 17 pulsars.

Moderate correlation between spectral index and spin frequency.

Most pulsars had low S/N ratio, limiting polarization measurements.

Abstract

Flux densities are basic observation parameters to describe pulsars. In the most updated pulsar catalog, 24% of the listed radio pulsars have no flux density measurement at any frequency. Here, we report the first flux density measurements, spectral indices, pulse profiles, and correlations of the spectral index with pulsar parameters for 19 pulsars employing the Ultra-Wideband Low (UWL) receiver system installed on the Parkes radio telescope. The results for spectral indices of 17 pulsars are in the range between -0.6 and -3.10. The polarization profiles of thirteen pulsars are shown. There is a moderate correlation between the spectral index and spin frequency. For most pulsars detected, the S/N ratio of pulse profile is not high, so DM, Faraday rotation measure (RM), and polarization can not be determined precisely. Twenty-nine pulsars were not detected in our observations. We discuss the possible explanations for why these pulsars were not detected.