| Abstract : | Pulsars are excellent astrophysical laboratories for studying physics under extreme gravitational and magnetic fields. After more than five decades of research, physical processes that govern their radio emission mechanism remain an outstanding problem. PSR J0026-1955 was independently discovered by the MWA (McSweeney et al. 2022), and it exhibits unusual sub-pulse drifting characteristics, a large (~70%) nulling fraction and mode changing. These characteristics make it an excellent source for uncovering the intricacies of pulsar emission. We observed this pulsar using the upgraded Giant Meterwave Radio Telescope (uGMRT) at dual frequency bands, covering a frequency range of 300-750 MHz. Our preliminary analysis confirms the peculiar subpulse drifting behaviour seen in MWA data, including at least two distinct drifting modes, rapid changes between these modes and an evolution of drift rate within a mode. Our analysis also reveals the evolution toward a faster drift rate is usually followed by a null sequence, and there is also some evidence for memory across nulls. With all these intriguing properties, PSR J0026-1955 presents an ideal testbed for the carousel model of sparks and holds the potential to uncover the intricacies of pulsar emission physics. |
