Eight new millisecond pulsars from the first MeerKAT globular cluster census-Reference-Cited by-同舟云学术

Eight new millisecond pulsars from the first MeerKAT globular cluster census

Published:2021-03-18 Issue:1 Volume:504 Page:1407-1426
ISSN:0035-8711
Container-title:Monthly Notices of the Royal Astronomical Society
language:en
Short-container-title:

Author:

Ridolfi A¹²^ORCID,Gautam T²,Freire P C C²^ORCID,Ransom S M³^ORCID,Buchner S J⁴^ORCID,Possenti A¹⁵,Venkatraman Krishnan V²^ORCID,Bailes M⁶⁷,Kramer M²⁸^ORCID,Stappers B W⁸^ORCID,Abbate F²^ORCID,Barr E D²^ORCID,Burgay M¹^ORCID,Camilo F⁴,Corongiu A¹^ORCID,Jameson A⁶⁷,Padmanabh P V²^ORCID,Vleeschower L⁸,Champion D J²^ORCID,Chen W²,Geyer M⁴^ORCID,Karastergiou A⁹¹⁰,Karuppusamy R²,Parthasarathy A²^ORCID,Reardon D J⁶⁷^ORCID,Serylak M⁴,Shannon R M⁶⁷^ORCID,Spiewak R⁸⁶^ORCID

Affiliation:

1. INAF – Osservatorio Astronomico di Cagliari, Via della Scienza 5, I-09047 Selargius (CA), Italy

2. Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany

3. National Radio Astronomy Observatory, 520 Edgemont Rd., Charlottesville, VA 22903, USA

4. South African Radio Astronomy Observatory (SARAO), 2 Fir Street, Black River Park, Observatory, Cape Town 7925, South Africa

5. Dipartimento di Fisica, Università di Cagliari, S.P. Monserrato-Sestu Km 0,700, I-09042 Monserrato (CA), Italy

6. Centre for Astrophysics and Supercomputing, Swinburne University of Technology, P.O. Box 218, Hawthorn, VIC 3122, Australia

7. OzGrav: The ARC Centre of Excellence for Gravitational-wave Discovery, PO Box 218, Hawthorn, VIC 3122, Australia

8. Jodrell Bank Centre for Astrophysics, Department of Physics and Astronomy, The University of Manchester, Manchester M13 9PL, UK

9. Department of Astrophysics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, UK

10. Department of Physics and Electronics, Rhodes University, PO Box 94, Grahamstown 6140, South Africa

Abstract

ABSTRACT We have used the central 44 antennas of the new 64-dish MeerKAT radio telescope array to conduct a deep search for new pulsars in the core of nine globular clusters (GCs). This has led to the discovery of eight new millisecond pulsars in six different clusters. Two new binaries, 47 Tuc ac and 47 Tuc ad, are eclipsing ‘spiders’, featuring compact orbits (≲0.32 d), very low mass companions, and regular occultations of their pulsed emission. The other three new binary pulsars (NGC 6624G, M62G, and Ter 5 an) are in wider (>0.7 d) orbits, with companions that are likely to be white dwarfs or neutron stars. NGC 6624G has a large eccentricity of e ≃ 0.38, which enabled us to detect the rate of advance of periastron. This suggests that the system is massive, with a total mass of Mtot = 2.65 ± 0.07 M⊙. Likewise, for Ter 5 an, with e ≃ 0.0066, we obtain Mtot = 2.97 ± 0.52 M⊙. The other three new discoveries (NGC 6522D, NGC 6624H, and NGC 6752F) are faint isolated pulsars. Finally, we have used the whole MeerKAT array and synthesized 288 beams, covering an area of ∼2 arcmin in radius around the centre of NGC 6624. This has allowed us to localize many of the pulsars in the cluster, demonstrating the beamforming capabilities of the TRAPUM software backend and paving the way for the upcoming MeerKAT GC pulsar survey.

Funder

Autonomous Region of Sardinia

Australian Research Council

Istituto Nazionale di Astrofisica

Ministero degli Affari Esteri e della Cooperazione Internazionale

NSF

European Research Council

University of Manchester

Science and Technology Facilities Council

Publisher

Oxford University Press (OUP)

Subject