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arxiv 2201.11238 v3 pith:XFGFTE6W submitted 2022-01-27 astro-ph.HE

Two New Black Widow Millisecond Pulsars In M28

Andrew Douglas , Prajwal Padmanabh , Scott Ransom , Alessandro Ridolfi , Paulo Freire , Vivek Venkatraman Krishnan , Ewan Barr , Cristina Pallanca
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Mario Cadelano Andrea Possenti Ingrid Stairs Jason Hessels Megan DeCesar Ryan Lynch Matthew Bailes Marta Burgay David Champion Ramesh Karuppusamy Michael Kramer Benjamin Stappers Laila Vleeschower
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keywords pulsarsblackclustermeerkatpulsarsearcheswidowglobular
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We report the discovery of two Black Widow millisecond pulsars in the globular cluster M28 with the MeerKAT telescope. PSR J1824$-$2452M (M28M) is a 4.78-ms pulsar in a $5.82\,$hour orbit and PSR J1824$-$2452N (M28N) is a 3.35-ms pulsar in a $4.76\,$hour orbit. Both pulsars have dispersion measures near $119.30\,$pc$\,$cm$^{-3}$ and have low mass companion stars ($\sim$$0.01-0.03\,$M$_\odot$), which do not cause strong radio eclipses or orbital variations. Including these systems, there are now five known black widow pulsars in M28. The pulsar searches were conducted as a part of an initial phase of MeerKAT's globular cluster census (within the TRAPUM Large Survey Project). These faint discoveries demonstrate the advantages of MeerKAT's survey sensitivity over previous searches and we expect to find additional pulsars in continued searches of this cluster.

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  1. Pulsars in Globular Clusters With the SKAO

    astro-ph.HE 2026-07 conditional novelty 3.0

    SKA-MID and SKA-LOW are predicted to discover 150–1700 new pulsars in Galactic globular clusters, more than doubling the current population of 345.