A single pulse study of a millisecond pulsar PSR J0621+1002

TL;DR

This study analyzes single pulse emissions from the millisecond pulsar PSR J0621+1002 using FAST, revealing periodic intensity modulations and examining their impact on timing precision, with no significant improvement found.

Contribution

It provides the first detailed single pulse analysis of PSR J0621+1002, identifying pulse modulation patterns and assessing their effect on timing accuracy.

Findings

Pulse intensity modulations with specific periodicities.

Two classes of pulses based on timing residuals.

No significant timing precision improvement from pulse class selection.

Abstract

We present radio observation of a millisecond pulsar PSR J0621+1002 using the Five-hundred-meter Aperture Spherical radio Telescope (FAST). The pulsar shows periodic pulse intensity modulations for both the first and the third pulse components. The fluctuation spectrum of the first pulse component has one peak of 3.0$\pm$0.1 pulse periods, while that of the third pulse component has two diffused peaks of 3.0$\pm$0.1 and 200$\pm$1 pulse periods. The single pulse timing analysis is carried out for this pulsar and the single pulses can be divided into two classes based on the post-fit timing residuals. We examined the achievable timing precision using only the pulses in one class or bright pulses. However, the timing precision improvement is not achievable.