Discovery and Timing of 49 Pulsars from the Arecibo 327 MHz Drift Survey

Abstract We present 18 pulsar discoveries from the AO327 pulsar survey, along with their timing solutions and those for an additional 31 AO327-discovered pulsars. Timing solutions were constructed using observations from a follow-up timing campaign taken during the period of 2013–2019 using the Arecibo Observatory’s 327 MHz receiver. Aside from PSR J0916+0658, an isolated pulsar that shows evidence for partial recycling, the remaining discoveries are nonrecycled pulsars. We present a brief census of emission features for all pulsars with the following standouts. PSR J1942+0142 is found to exhibit the very rare phenomenon of subpulse bi-drifting, and PSR J0225+1727 has an interpulse. We also report distance estimates using the NE2001, YMW16, and NE2025 Galactic electron density models and identify at least 10 sources where one or more models underestimate the maximum Galactic line-of-sight dispersion measure. We compare our discoveries with those of the GBNCC survey, finding that off the Galactic plane, the majority of failures arise from YMW16, while in the Galactic plane, NE2025 shows a marginal degradation of performance relative to NE2001.