A Single-pulse Study of the Subpulse Drifter PSR J1631+1252 Discovered at FAST

Abstract We report on the pulse-to-pulse energy distribution and longitude-resolved modulation properties of PSR J1631+1252 discovered by Five-hundred-meter Aperture Spherical radio Telescope. Our analysis made use data acquired at 1250 MHz from follow-up timing observations that lasted over a year. has rotational period ∼0.310 s, dispersion measure ∼32.73 pc cm −3 . The is well described lognormal distribution, parameters which do not vary with time. show large occurs across bridge emission pulse profile, sporadic bright bursts leading region. fluctuation spectral reveals existence subpulse drifting in component vertical spacing between drift bands 3.28 ± 0.08 periods consecutive bands. Possible physical mechanisms for are discussed.