4.7 Article

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

Journal

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 519, Issue 4, Pages 5590-5606

Publisher

OXFORD UNIV PRESS
DOI: 10.1093/mnras/stac3742

Keywords

binaries; general - pulsars; individual; J1036-4353; J1526-2744; J1803-6707-gamma rays; stars

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By conducting targeted survey using the Transients and Pulsars with MeerKAT (TRAPUM) Large Survey Project, we discovered 9 new millisecond pulsars, including 8 in binary systems. We obtained timing solutions for two pulsars, enabling the detection of gamma-ray pulsations. X-ray emission from PSR J1803-6707 was detected in the eROSITA all-sky survey data.
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 $\sim 100\, \mu$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 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 x 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.

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