Drifting sub-pulses in two newly discovered pulsars

Abstract

We have detected the rare phenomenon of stable, drifting sub-pulse behaviour in two pulsars discovered in the recent Swinburne intermediate latitude pulsar survey. The pulsars, PSR J1231 - 47 and PSR J1919+0134, have approximate periods (P) of 1.873 and 1.6039s respectively. Both pulsars have multicomponent profiles, and distinct drifting is observed across them. We have identified a single drift mode in both pulsars: the drift rate for PSR J1231 - 47 being 5.4(1) ms P-1 and 5.8(2) ms P-1 for PSR 1919+0134. The drifting is linear across the profile with no departure from linearity at the edges within the sensitivity of our observations.