Individual pulse emission from the diffuse drifter PSR J1401-6357 using the ultrawideband receiver on the Parkes radio telescope

In this study, we report on a detailed single pulse analysis of the radio emission from the pulsar J1401 - 6357 (B1358 - 63) based on data observed with the ultrawideband low-frequency receiver on the Parkes radio telescope. In addition to a weak leading component, the integrated pulse profile features a single-humped structure with a slight asymmetry. The frequency evolution of the pulse profile is studied. Well-defined nulls, with an estimated nulling fraction greater than 2 per cent, are present across the whole frequency band. No emission is detected with significance above 3 sigma in the average pulse profile integrated over all null pulses. Using fluctuation spectral analysis, we reveal the existence of temporal-dependent subpulse drifting in this pulsar for the first time. A clear double-peaked feature is present at exactly the alias border across the whole frequency band, which suggests that the apparent drift sense changes during the observation. Our observations provide further confirmation that the phenomena of pulse nulling and subpulse drifting are independent of observing frequency, which suggest that they invoke changes on the global magnetospheric scale.

Automated summary

In this study, we analyze the radio emission from the pulsar J1401-6357 (B1358-63) using data from the Parkes radio telescope. The pulse profile shows a weak leading component and a single-humped structure with slight asymmetry. Nulls are observed across the entire frequency band, with an estimated nulling fraction greater than 2 percent. The presence of temporal-dependent subpulse drifting and a double-peaked feature at the alias border suggest global magnetospheric changes.