Discovery of 15 new pulsars at high Galactic Latitudes with FAST

TL;DR

This paper reports the discovery of 15 new pulsars, including millisecond pulsars, using FAST at high Galactic latitudes, providing new insights into pulsar populations near the Galactic Bulge.

Contribution

The study presents the discovery and timing of 15 pulsars, including three in binary systems, and demonstrates the potential of deep high-latitude surveys to explore pulsar populations.

Findings

15 new pulsars discovered, including 4 MSPs

3 MSPs in binary systems with various orbital periods

Deep high-latitude surveys can significantly enhance pulsar population understanding

Abstract

We present the discovery and timing results of 15 pulsars discovered in a high Galactic latitude survey conducted with the Five-hundred-meter Aperture Spherical Telescope (FAST). The survey targeted a region as close as possible to the Galactic Center, encompassing an area near the Galactic Bulge. The newly discovered pulsars consist of eleven normal pulsars and four millisecond pulsars (MSPs). Among the MSPs, three are identified in binary systems with orbital periods of ~3.1, 4.6 and 12.5 days, respectively. We have successfully obtained coherent timing solutions for three of the normal pulsars (PSRs J1745-0059, J1746-0156 and J1800-0059). Furthermore, within our data set we found that four pulsars (three new and one known) show mode-changing and/or subpulse drifting phenomena. Comparing our discoveries with simulations of the Galactic disk and Bulge MSP populations indicates that these new pulsars are most likely located in the disk. Nonetheless, our discoveries demonstrate that deep surveys at high Galactic latitudes have significant potential to enhance our understanding of the MSP population in the direction of the Bulge.