TMRT observations of 26 pulsars at 8.6 GHz

TL;DR

This paper presents high-frequency (8.6 GHz) observations of 26 pulsars using the TMRT, revealing profile shape variations, spectral index differences, and core width estimates, with some profiles observed for the first time at this frequency.

Contribution

First high-frequency (8.6 GHz) pulsar profiles obtained for 11 pulsars, with improved data for 4, and analysis of profile shape, spectral indices, and core widths.

Findings

Nine pulsars show decreasing component separation with frequency.

Spectral indices vary among profile components, affecting shape evolution.

Core widths follow the width-period relationship.

Abstract

Integrated pulse profiles at 8.6~GHz obtained with the Shanghai Tian Ma Radio Telescope (TMRT) are presented for a sample of 26 pulsars. Mean flux densities and pulse width parameters of these pulsars are estimated. For eleven pulsars these are the first high-frequency observations and for a further four, our observations have a better signal-to-noise ratio than previous observations. For one (PSR J0742-2822) the 8.6~GHz profiles differs from previously observed profiles. A comparison of 19 profiles with those at other frequencies shows that in nine cases the separation between the outmost leading and trailing components decreases with frequency, roughly in agreement with radius-to-frequency mapping, whereas in the other ten the separation is nearly constant. Different spectral indices of profile components lead to the variation of integrated pulse profile shapes with frequency. In seven pulsars with multi-component profiles, the spectral indices of the central components are steeper than those of the outer components. For the 12 pulsars with multi-component profiles in the high-frequency sample, we estimate the core width using gaussian fitting and discuss the width-period relationship.