Now showing items 1-11 of 11

    • The anatomy of γ-ray pulsar light curves 

      Seyffert, A.S.; Venter, C.; Johnson, T.J.; Harding, A.K. (South African Institute of Physics, 2014)
      To obtain constraints on the inclination and observer angles, <i>α</i> and <i>ζ</i>, of a <i>γ</i>-ray pulsar from its observed light curve (LC), we make use of geometric models detailing the position and extent of emission ...
    • Broadband pulsations from PSR B1821-24: implications for emission models and the pulsar population of M28 

      Johnson, T.J.; Venter, C.; Guillemot, L.; Kerr, M.; Cognard, I.; Fermi LAT (IOP Publishing, 2013)
      We report the Fermi Large Area Telescope discovery of γ-ray pulsations from the 22.7 ms pulsar A in the double pulsar system J0737−3039A/B. This is the first mildly recycled millisecond pulsar (MSP) detected in the GeV ...
    • Constraints on the emission geometries and spin evolution of gamma-ray millisecond pulsars 

      Johnson, T.J.; Venter, C.; Harding, A.K.; Guillemot, L.; Smith, D.A. (IOP Publishing, 2014)
      Millisecond pulsars (MSPs) are a growing class of gamma-ray emitters. Pulsed gamma-ray signals have been detected from more than 40 MSPs with the Fermi Large Area Telescope (LAT). The wider radio beams and more compact ...
    • Discovery of two millisecond pulsars in Fermi sources with the nançay radio telescope 

      Cognard, I.; Venter, C.; Guillemot, L.; Johnson, T.J.; Smith, D.A.; Fermi LAT (IOP Publishing, 2011)
      We report the discovery of two millisecond pulsars in a search for radio pulsations at the positions of Fermi-Large Area Telescope sources with no previously known counterparts, using the Nan¸cay Radio Telescope. The two ...
    • The effect of different magnetospheric structures on predictions of gamma-ray pulsar light curves 

      Breed, M.; Venter, C.; Harding, A.K.; Johnson, T.J. (South African Institute of Physics, 2012)
      The second pulsar catalogue of the Fermi Large Area Telescope (LAT) will contain in excess of 100 gamma-ray pulsars. The light curves (LCs) of these pulsars exhibit a variety of shapes, and also different relative phase ...
    • Fermi LAT pulsed detection of PSR J0737-3039A in the double pulsar system 

      Guillemot, L.; Venter, C.; Kramer, M.; Johnson, T.J.; Craig, H.A.; Fermi LAT (IOP Publishing, 2013)
      We report the Fermi Large Area Telescope discovery of γ-ray pulsations from the 22.7 ms pulsar A in the double pulsar system J0737−3039A/B. This is the first mildly recycled millisecond pulsar (MSP) detected in the GeV ...
    • Implementation of an offset-dipole magnetic field in a pulsar modelling code 

      Breed, M.; Venter, C.; Harding, A.K.; Johnson, T.J. (South African Institute of Physics, 2013)
      The field of gamma-ray pulsars (rapidly spinning and highly magnetized neutron stars (NSs)) has been revolutionized by the launch of <i>Fermi</i> Large Area Telescope (LAT) in June 2008. <i>Fermi</i> LAT will soon release ...
    • Modeling phase-aligned gamma-ray and radio millisecond pulsar light curves 

      Venter, C.; Johnson, T.J.; Harding, A.K. (IOP Publishing, 2012)
      Since the discovery of the first eight gamma-ray millisecond pulsars (MSPs) by the Fermi Large Area Telescope, this population has been steadily expanding. Four of the more recent detections, PSR J0034–0534, PSR J1939+2134 ...
    • Modelling the light curves of Fermi LAT millisecond pulsars 

      Venter, C.; Johnson, T.J.; Harding, A.K.; Grove, J.E. (South African Institute of Physics, 2014)
      There are 40 millisecond pulsars (MSPs) in the second pulsar catalogue of the Fermi Large Area Telescope (LAT). This pulsar subpopulation is unique owing to their relatively small magnetospheres. This may result in radio ...
    • Modelling the y-ray and radio light curves of the double pulsar system 

      Seyffert, A.S.; Venter, C.; Harding, A.K.; Johnson, T.J. (South African Institute of Physics, 2014)
      Guillemot et al. recently reported the discovery [1] of -ray pulsations from the 22.7 ms pulsar (pulsar A) in the famous double pulsar system J0737−3039A/B. The -ray light curve (LC) of pulsar A has two peaks separated ...
    • Pulsed gamma rays from the original millisecond and black widow pulsars: a case for caustic radio emission? 

      Guillemot, L.; Venter, C.; Johnson, T.J.; Kerr, M.; Pancrazi, B.; Fermi LAT (IOP Publishing, 2012)
      We report the detection of pulsed gamma-ray emission from the fast millisecond pulsars (MSPs) B1937+21 (also known as J1939+2134) and B1957+20 (J1959+2048) using 18 months of survey data recorded by the Fermi Large Area ...