Now showing items 1-6 of 6

    • Early science with the Karoo Array Telescope: a mini-halo candidate in galaxy cluster Abell 3667 

      Riseley, C.J.; Oozeer, N.; Scaife, A.M.M.; Magnus, L.; Wise, M.W. (Oxford University Press, 2015)
      Abell 3667 is among the most well-studied galaxy clusters in the Southern hemisphere. It is known to host two giant radio relics and a head–tail radio galaxy as the brightest cluster galaxy. Recent work has suggested the ...
    • 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 ...
    • The modulation of galactic cosmic-ray electrons in the heliosheath 

      Caballero-Lopez, R.A.; Moraal, H.; McDonald, F.B. (IOP Publishing, 2010)
      Voyager 1 has observed strong increases in the intensities of 2-160 MeV electrons since crossing the termination shock of the heliosphere in 2004 December. Before this time these intensities were submerged below the detector ...
    • Opacities for photon splitting and pair creation in neutron star magnetospheres 

      Hu, Kun; Wadiasingh, Zorawar; Baring, Matthew G.; Harding, Alice K. (Oxford Univ Press, 2019)
      Over the last four decades, persistent and flaring emission of magnetars observed by various telescopes has provided us with a suite of light curves and spectra in soft and hard X-rays, with no emission yet detected above ...
    • Scaling of relativistic shear flows with the bulk Lorentz factor 

      Liang, Edison; Böttcher, Markus; Roustazadeh, Parisa; Fu, Wen (IOP Publishing, 2018)
      We compare Particle-in-cell simulation results of relativistic electron–ion shear flows with different bulk Lorentz factors, and discuss their implications for spine-sheath models of blazar versus gamma-ray burst (GRB) ...
    • Toward a greater understanding of the reduction of drift coefficients in the presence of turbulence 

      Engelbrecht, N.E.; Strauss, R.D.; Burger, R.A.; Le Roux, J.A. (IOP Publishing, 2017)
      Drift effects play a significant role in the transport of charged particles in the heliosphere. A turbulent magnetic field is also known to reduce the effects of particle drifts. The exact nature of this reduction, however, ...