Detailed emission analysis of three slow-period pulsars using FAST

Habtamu Menberu Tedila

In this study, we detail the unique emission behaviors of three slow-period pulsars detected using the Five-hundred-meter Aperture Spherical radio Telescope (FAST) during the Commensal Radio Astronomy FAST Survey (CRAFTS). These pulsars, PSR J1945+1221, PSR J2323+1214, and PSR J1900-0134, exhibited a quasi-periodic nulling phenomenon, with their emissions showing regular interruptions and the observed nulling duration lasting about 57 seconds. Among them, PSR J2323+1214 displayed a different nulling pattern, with the most extended nulling observed being 71.44 seconds. For the three pulsars, the nulling fractions ranged between 28% and 57%, with rotational periods from 1.83 s to 4.75 s. Differing from the aforementioned pulsars, PSR J1900-0134 displayed complex emission features, and our high-resolution data revealed intricate microstructure pulses, with details down to a mere 1.57 microseconds. Bright pulses occur in all these sources with different occurrence rates. These observations suggest complex magnetospheric processes, potentially related to magnetic reconnections, and provide insights into the origins of bright and microstructure pulses, as well as their distinctions from ordinary pulses. This research, leveraging the unparalleled sensitivity of FAST, deepens our understanding of the diverse emission behaviors in long-period pulsars.