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

TL;DR

This paper reports 49 pulsar discoveries from the AO327 survey, providing their timing solutions, emission features, distance estimates, and comparisons with other surveys, highlighting rare phenomena and model discrepancies.

Contribution

It presents 18 new pulsar discoveries with detailed timing solutions and emission features, and compares Galactic electron density models for distance estimation accuracy.

Findings

Discovery of 18 new pulsars with timing solutions.

Identification of rare emission phenomena like subpulse bi-drifting.

Comparison showing model discrepancies in distance estimates.

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 between the periods 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 non-recycled 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 either 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.