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

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.
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
File in questo prodotto:
File Dimensione Formato  
Douglas_2022_ApJ_927_126.pdf

accesso aperto

Tipo: Versione (PDF) editoriale
Licenza: Licenza per Accesso Aperto. Creative Commons Attribuzione (CCBY)
Dimensione 3.9 MB
Formato Adobe PDF
3.9 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11585/879202
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 1
  • ???jsp.display-item.citation.isi??? 1
social impact