학술논문
The TRAPUM L-band survey for pulsars in Fermi-LAT gamma-ray sources
Document Type
Working Paper
Author
Clark, C. J.; Breton, R. P.; Barr, E. D.; Burgay, M.; Thongmeearkom, T.; Nieder, L.; Buchner, S.; Stappers, B.; Kramer, M.; Becker, W.; Mayer, M.; Phosrisom, A.; Ashok, A.; Bezuidenhout, M. C.; Calore, F.; Cognard, I.; Freire, P. C. C.; Geyer, M.; Grießmeier, J. -M.; Karuppusamy, R.; Levin, L.; Padmanabh, P. V.; Possenti, A.; Ransom, S.; Serylak, M.; Krishnan, V. Venkatraman; Vleeschower, L.; Behrend, J.; Champion, D. J.; Chen, W.; Horn, D.; Keane, E. F.; Künkel, L.; Men, Y.; Ridolfi, A.; Dhillon, V. S.; Marsh, T. R.; Papa, M. A.
Source
MNRAS, 519, 5590-5606 (2023)
Subject
Language
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 minutes on two separate epochs using MeerKAT's L-band receiver (856-1712 MHz), with typical pulsed flux density sensitivities of $\sim$100$\,\mu$Jy. Nine new MSPs were discovered, eight of which are in binary systems, including two eclipsing redbacks and one system, PSR J1526$-$2744, that appears to have a white dwarf companion in an unusually compact 5 hr orbit. We obtained phase-connected timing solutions for two of these MSPs, enabling the detection of gamma-ray pulsations in the Fermi-LAT data. A follow-up search for continuous gravitational waves from PSR J1526$-$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 $2.45\times10^{-8}$. 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 intra-binary shock.
Comment: 17 pages, 8 figures, accepted for publication in MNRAS
Comment: 17 pages, 8 figures, accepted for publication in MNRAS