Four pulsar discoveries in NGC 6624 by TRAPUM using MeerKAT

Abbate, F.; Ridolfi, A.; Barr, E. D.; Buchner, S.; Burgay, M.; Champion, D. J.; Chen, W.; Freire, P. C. C.; Gautam, T.; Grießmeier, J.-M.; Künkel, L.; Kramer, M.; Padmanabh, P. V.; Possenti, A.; Ransom, S.; Serylak, M.; Stappers, B. W.; Krishnan, V. Venkatraman; Behrend, J.; Breton, R. P.; Levin, L.; Men, Y.

doi:10.1093/mnras/stac1041

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Four pulsar discoveries in NGC 6624 by TRAPUM using MeerKAT

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Padmanabh, P. V.
Observational Relativity and Cosmology, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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Citation

Abbate, F., Ridolfi, A., Barr, E. D., Buchner, S., Burgay, M., Champion, D. J., et al. (2022). Four pulsar discoveries in NGC 6624 by TRAPUM using MeerKAT. Monthly Notices of the Royal Astronomical Society, 513(2), 2292-2301. doi:10.1093/mnras/stac1041.

Cite as: https://hdl.handle.net/21.11116/0000-000A-917B-8

Abstract

We report 4 new pulsars discovered in the core-collapsed globular cluster
(GC) NGC 6624 by the TRAPUM Large Survey Project with the MeerKAT telescope.
All of the new pulsars found are isolated. PSR J1823$-$3021I and PSR
J1823$-$3021K are millisecond pulsars with period of respectively 4.319 ms and
2.768 ms. PSR J1823$-$3021J is mildly recycled with a period of 20.899 ms, and
PSR J1823$-$3022 is a long period pulsar with a period of 2.497 s. The pulsars
J1823$-$3021I, J1823$-$3021J, and J1823$-$3021K have position and dispersion
measure (DM) compatible with being members of the GC and are therefore
associated with NGC 6624. Pulsar J1823$-$3022 is the only pulsar bright enough
to be re-detected in archival observations of the cluster. This allowed the
determination of a timing solution that spans over two decades. It is not
possible at the moment to claim the association of pulsar J1823$-$3022 with the
GC given the long period and large offset in position ($\sim 3$ arcminutes) and
DM (with a fractional difference of 11 percent compared the average of the
pulsars in NGC 6624). The discoveries made use of the beamforming capability of
the TRAPUM backend to generate multiple beams in the same field of view which
allows sensitive searches to be performed over a few half-light radii from the
cluster center and can simultaneously localise the discoveries. The discoveries
reflect the properties expected for pulsars in core-collapsed GCs.