Subpulse drifting of PSR J1514–4834

Abstract

In this paper, we report the detailed observation of the drift subpulse behavior of PSR J1514–4834 at a central frequency of 1369 MHz using the Parkes 64-m radio telescope. We have found that individual pulses of this pulsar exhibit distinct modulation behaviors for different profile components. The leading and middle components display periodic amplitude modulation with a period of \(\mathrm{P}_{3}=37.5\pm 0.8\, \mathrm{P}\), and a drifting sub-pulse phenomenon is detected in the phase region of trailing component with the measured drifting periods \(\mathrm{P}_{2}=7.0\pm 0.4\,\mathrm{P}\) and \(\mathrm{P}_{3}=37.5\pm 0.8\, \mathrm{P}\). Additionally, it was observed that the leading and trailing components of the pulsar have a clear correlation, the middle and trailing components have a clear anti-correlation, and there is no apparent correlation between the leading and middle components. Moreover, this pulsar deviates from the range of most amplitude-modulated pulsars in the \(\dot{\mathrm{E}}-\mathrm{P}_{3}\) diagram, but it still falls within the category of subpulse drifting. PSR J1514–4834 exhibits periodic emission modulation and sub-pulse drifting simultaneously in different profile components, which is difficult to understand with the traditional carousel model. Our observational results will provide new observation evidence for theoretical studies of single-pulse emission mechanisms in pulsars.