The TRAPUM L-band survey for pulsars in Fermi-LAT gamma-ray sources

verfasst von

C J Clark, R P Breton, E D Barr, M Burgay, T Thongmeearkom, L Nieder, S Buchner, B Stappers, M Kramer, W Becker, M Mayer, A Phosrisom, A Ashok, M C Bezuidenhout, F Calore, I Cognard, P C C Freire, M Geyer, J-m Grießmeier, R Karuppusamy, L Levin, P V Padmanabh, A Possenti, S Ransom, M Serylak, V Venkatraman Krishnan, L Vleeschower, J Behrend, D J Champion, W Chen, D Horn, E F Keane, L Künkel, Y Men, A Ridolfi, V S Dhillon, T R Marsh, M A Papa

Abstract

More than 100 millisecond pulsars (MSPs) have been discovered in radio observations of gamma-ray sources detected by the Fermi Large Area Telescope (LAT), but hundreds of pulsar-like sources remain unidentified. Here, we present the first results from the targeted survey of Fermi-LAT sources being performed by the Transients and Pulsars with MeerKAT (TRAPUM) Large Survey Project. We observed 79 sources identified as possible gamma-ray pulsar candidates by a Random Forest classification of unassociated sources from the 4FGL catalogue. Each source was observed for 10 min on two separate epochs using MeerKAT's L-band receiver (856-1712 MHz), with typical pulsed flux density sensitivities of ∼ 100 μJy. Nine new MSPs were discovered, eight of which are in binary systems, including two eclipsing redbacks and one system, PSR J1526-2744, that appears to have a white dwarf companion in an unusually compact 5 h orbit. We obtained phase-connected timing solutions for two of these MSPs, enabling the detection of gamma-ray pulsations in the Fermi-LAT data. A follow-up search for continuous gravitational waves from PSR J1526-2744 in Advanced LIGO data using the resulting Fermi-LAT timing ephemeris yielded no detection, but sets an upper limit on the neutron star ellipticity of 2.45 × 10-8. We also detected X-ray emission from the redback PSR J1803-6707 in data from the first eROSITA all-sky survey, likely due to emission from an intrabinary shock.

Organisationseinheit(en)

Institut für Gravitationsphysik

Externe Organisation(en)

Max-Planck-Institut für Gravitationsphysik (Albert-Einstein-Institut)
University of Manchester
Max-Planck-Institut für Radioastronomie
Osservatorio Astronomiico di Cagliari (OAC)
South African Radio Astronomy Observatory (SARAO)
Universität Mannheim
Max-Planck-Institut für extraterrestrische Physik
Laboratoire de Physique et de Chimie de l’Environnement et de l’Espace (LPC2E)
National Radio Astronomy Observatory Socorro
University of the Western Cape
South African Astronomical Observatory
Trinity College Dublin
Universität Bielefeld
The University of Sheffield
University of Warwick

Typ

Artikel

Journal

Monthly Notices of the Royal Astronomical Society

Band

519

Seiten

5590-5606

Anzahl der Seiten

17

ISSN

0035-8711

Publikationsdatum

03.2023

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Astronomie und Astrophysik, Astronomie und Planetologie

Elektronische Version(en)

https://doi.org/10.48550/arXiv.2212.08528 (Zugang: Offen)
https://doi.org/10.1093/mnras/stac3742 (Zugang: Geschlossen)