Browsing by Subject "Magnetic fields"
Now showing items 1-10 of 12
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Constraining the emission geometry and mass of the white dwarf pulsar AR Sco using the rotating vector model
(IOP Publishing, 2019)We apply the standard radio pulsar rotating vector model to the white dwarf (WD) pulsar AR Sco's optical polarization position angle swings folded at the WD's spin period as obtained by Buckley et al. Owing to the long ... -
Early science with the Karoo Array Telescope: a mini-halo candidate in galaxy cluster Abell 3667
(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 ... -
The effect of different magnetospheric structures on predictions of gamma-ray pulsar light curves
(North-West University (South Africa), 2015)The field of -ray pulsars has been revolutionised by the launch of the Fermi Large Area Telescope, increasing the population from 7 to 161 detected pulsars. The light curves of these y-ray pulsars exhibit a variety of ... -
Exploring the acceleration mechanisms for particle injection and power-law formation during transrelativistic magnetic reconnection
(IOP Publishing, 2020)Magnetic reconnection in the relativistic and transrelativistic regimes is able to accelerate particles to hard power-law energy spectra f ∝ γ −p (approaching p = 1). The underlying acceleration mechanism that determines ... -
Hard spectral tails in magnetars
(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 ... -
Impact of ordered and disordered magnetic fields on multiwavelength emission of blazars
(IOP Publishing, 2020)We present a detailed analysis of the effects of magnetic field topology on the spectral energy distribution (SED) and spectral variability patterns (SVPs) of blazars. In order to study these effects, we have extended our ... -
Modelling pulsar emission in the high-energy and very-high-energy regimes
(North-West University (South Africa), 2021)The Fermi Large Area Telescope has revolutionised the γ-ray pulsar field, increasing the population to over 250 detected pulsars. The majority display spectra with exponential cutoffs in a narrow range around a few GeV. ... -
Modelling the perpendicular transport of energetic electrons in the inner heliosphere
(North-West University (South Africa), 2023)The transport of charged particles across a background magnetic field can occur through either particle drifts or perpendicular diffusion caused by magnetic turbulence. The former process, which was proposed by some as an ... -
The modulation of galactic cosmic-ray electrons in the heliosheath
(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
(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 ...