Now showing items 1-10 of 16

    • The effect of an offset polar cap dipolar magnetic field on the modeling of the Vela pulsar's γ-ray light curves 

      Barnard, M.; Venter, C.; Harding, K. (IOP Publishing, 2016)
      We performed geometric pulsar light curve modeling using static, retarded vacuum, and offset polar cap (PC) dipole B-fields (the latter is characterized by a parameter epsilon), in conjunction with standard two-pole caustic ...
    • The first Fermi Large Area Telescope catalog of gamma-ray pulsars 

      Abdo, A.A.; Venter, C.; Ackermann, M.; Ajello, M.; Atwood, W.B.; Fermi LAT (IOP Publishing, 2010)
      The dramatic increase in the number of known gamma-ray pulsars since the launch of the Fermi Gamma-ray Space Telescope (formerly GLAST) offers the first opportunity to study a sizable population of these high-energy objects. ...
    • Hard spectral tails in magnetars 

      Wadiasingh, Zorawar; Baring, Matthew G.; Gonthier, Peter L.; Harding, Alice K. (Cambridge Univ Press, 2017)
      Pulsed non-thermal quiescent emission between 10 keV and around 150 keV has been observed in ~10 magnetars. For inner magnetospheric models of such hard X-ray signals, resonant Compton upscattering of soft thermal photons ...
    • Modelling energy-dependent pulsar light curves 

      Venter, Christo; Barnard, Monica; Harding, Alice K.; Kalapotharakos, Constantinos (Cambridge Univ Press, 2018)
      In recent years, surprise discoveries of pulsed emission from the Crab and Vela pulsars above 100 GeV have drawn renewed attention to this largely unexplored region of the energy range. In this paper, we discuss example ...
    • Multi-messenger observations of a binary neutron star merger 

      Abdalla, H.; Böttcher, M.; Barnard, M.; H.E.S.S. Collaboration (IOP Publishing, 2017)
      On 2017 August 17 a binary neutron star coalescence candidate (later designated GW170817) with merger time 12:41:04 UTC was observed through gravitational waves by the Advanced LIGO and Advanced Virgo detectors. The Fermi ...
    • The orbit of the gamma-ray binary 1FGL J1018.6- 5856 

      Monageng, I.M.; Böttcher, M.; McBride, V.A.; Townsend, L.J.; Kniazev, A.Y. (IOP Publishing, 2017)
      Gamma-ray binaries are a small subclass of the high mass X-ray binary population that exhibit emission across the whole electromagnetic spectrum. We present the radial velocities of 1FGL J1018.6−5856 based on the observations ...
    • The orbit of the gamma-ray binary 1FGL J1018.6−5856 

      Monageng, I.M.; Böttcher, M.; McBride, V.A.; Townsend, L.J.; Kniazev, A.Y. (IOP, 2017)
      Gamma-ray binaries are a small subclass of the high mass X-ray binary population that exhibit emission across the whole electromagnetic spectrum. We present the radial velocities of 1FGL J1018.6−5856 based on the observations ...
    • Probing millisecond pulsar emission geometry using light curves from the Fermi/Large Area Telescope 

      Venter, Christo; Harding, A.K.; Guillemot, L. (IOP Publishing, 2009)
      An interesting new high-energy pulsar sub-population is emerging following early discoveries of gamma-ray millisecond pulsars (MSPs) by the Fermi Large Area Telescope (LAT). We present results from three-dimensional emission ...
    • PSR J2021+4026 in the gamma cygni region: the first variable γ-ray pulsar seen by the Fermi LAT 

      Allafort, A.; Venter, C.; Baldini, L.; Ballet, J.; Barbiellini, G.; Fermi LAT (IOP Publishing, 2013)
      Long-term monitoring of PSR J2021+4026 in the heart of the Cygnus region with the Fermi Large Area Telescope unveiled a sudden decrease in flux above 100 MeV over a timescale shorter than a week. The "jump" was near MJD ...
    • Repeating fast radio bursts from magnetars with low magnetospheric twist 

      Wadiasingh, Zorawar; Timokhin, Andrey (IOP Publishing, 2019)
      We analyze the statistics of pulse arrival times in fast radio burst (FRB) 121102 and demonstrate that they are remarkably similar to statistics of magnetar high-energy short bursts. Motivated by this correspondence, we ...