We report the discovery of two Black Widow millisecond pulsars in the globular cluster (GC) M28 with the MeerKAT telescope. PSR J1824-2452M (M28M) is a 4.78 ms pulsar in a 5.82 hr orbit, and PSR J1824-2452N (M28N) is a 3.35 ms pulsar in a 4.76 hr orbit. Both pulsars have dispersion measures near 119.30 pc cm(-3) and have low-mass companion stars (similar to 0.01-0.03 M (circle dot)) that 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 GC 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.
Two New Black Widow Millisecond Pulsars in M28 / Douglas, Andrew; Padmanabh, Prajwal V.; Ransom, Scott M.; Ridolfi, Alessandro; Freire, Paulo; Krishnan, Vivek Venkatraman; Barr, Ewan D.; Pallanca, Cristina; Cadelano, Mario; Possenti, Andrea; Stairs, Ingrid; Hessels, Jason W. T.; DeCesar, Megan E.; Lynch, Ryan S.; Bailes, Matthew; Burgay, Marta; Champion, David J.; Karuppusamy, Ramesh; Kramer, Michael; Stappers, Benjamin; Vleeschower, Laila. - In: THE ASTROPHYSICAL JOURNAL. - ISSN 0004-637X. - ELETTRONICO. - 927:1(2022), pp. 126.1-126.8. [10.3847/1538-4357/ac4744]
Two New Black Widow Millisecond Pulsars in M28
Pallanca, Cristina;Cadelano, Mario;
2022
Abstract
We report the discovery of two Black Widow millisecond pulsars in the globular cluster (GC) M28 with the MeerKAT telescope. PSR J1824-2452M (M28M) is a 4.78 ms pulsar in a 5.82 hr orbit, and PSR J1824-2452N (M28N) is a 3.35 ms pulsar in a 4.76 hr orbit. Both pulsars have dispersion measures near 119.30 pc cm(-3) and have low-mass companion stars (similar to 0.01-0.03 M (circle dot)) that 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 GC 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.| File | Dimensione | Formato | |
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