Browsing Conference Papers by Author "45573c19-3806-439a-9c30-00f9442d3b11"

Now showing items 1-9 of 9

    • The aid of optical studies in understanding millisecond pulsar binaries 

      Wadiasingh, Zorawar; Venter, Christo; Böttcher, Markus; Harding, Alice K. (Sissa Medialab, 2016)
      A large number of new “black widow” and “redback” energetic millisecond pulsars with irradiated stellar companions have been discovered through radio and optical searches of unidentified Fermi sources. Synchrotron emission, ...

    • Assessment of a statistical approach that facilitates the constraint of pulsar geometry via dualband light curve fitting 

      Bezuidenhout, Mechiel C.; Venter, Christo; Seyffert, Albertus S.; Harding, Alice K. (Sissa Medialab, 2017)
      The Large Area Telescope aboard the Fermi spacecraft has detected more than 200 γ-ray pulsars since its launch in 2008. By concurrently fitting standard geometric model light curves onto Fermi and radio data, researchers ...

    • 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 ...

    • High-energy emission from Black Widows and Redbacks 

      Wadiasingh, Zorawar; Venter, Christo; Böttcher, Markus; Harding, Alice K. (Sissa Medialab, 2015)
      A large number of new black widow and redback energetic millisecond pulsars with irradiated stellar companions have been discovered through radio searches of unidentified Fermi sources. We construct a 3D emission model ...

    • High-energy emission properties of pulsars 

      Venter, Christo; Harding, Alice K.; Grenier, Isabelle (PoS, 2017)
      The sheer number of new γ-ray pulsar discoveries by the Fermi Large Area Telescope since 2008, combined with the quality of new multi-frequency data, has caused a revolution in the field of high-energy rotation-powered ...

    • The millisecond pulsar contribution to the rising positron fraction 

      Venter, Christo; Kopp, Andreas; Büsching, Ingo; Harding, Alice K.; Gonthier, Peter L. (Sissa Medialab, 2016)
      Pair cascades from millisecond pulsars (MSPs) may be a primary source of Galactic electrons and positrons that contribute to the increase in positron flux above 10 GeV as observed by PAMELA and AMS−02. The Fermi Large ...

    • 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 ...

    • Modelling energy-dependent pulsar light curves due to curvature radiation 

      Barnard, Monica; Venter, Christo; Harding, Alice K.; Kalapotharakos, Constantinos (Sissa Medialab, 2017)
      Pulsars emit pulsed emission across the entire electromagnetic spectrum and their light curve phenomenology is strongly dependent on energy. This is also true for the gamma-ray waveband. Continued detections by Fermi Large ...

    • MSP binaries as astrophysical laboratories 

      Wadiasingh, Zorawar; Venter, Christo; Böttcher, Markus; Harding, Alice K.; Baring, Matthew G. (Cambridge Univ Press, 2018)
      Follow-up of unidentified Fermi sources has expanded the number of known galactic-field “black widow” and “redback” millisecond pulsar binaries from four to nearly 30. Several systems observed by Chandra, XMM-Newton, Suzaku, ...