Browsing by Subject "Gamma rays"

Now showing items 1-9 of 9

    • Millisecond pulsars and pulsar wind nebulae as sources of gamma rays and cosmic rays 

      Venter, Christo (North-West University, 2008)
      Our main aim was to implement a fully 3D General Relativistic (GR) frame-dragging polar cap (PC) millisecond pulsar (MSP) model as a numerical code, and constrain it using multiwavelength and cosmic-ray data. We also ...

    • Modelling globular clusters as multi-wavelength diffuse emitters 

      David, Hambeleleni (North-West University (South Africa), 2021)
      The future ground-based Cherenkov Telescope Array (CTA) is expected to detect more than half of the known Galactic globular cluster (GC) population. In this thesis I present results from an emission code that assumes ...

    • Modelling pulsar emission in the high-energy and very-high-energy regimes 

      Barnard, Monica (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. ...

    • Monte Carlo studies for the optimisation of the Cherenkov Telescope Array layout 

      Acharyya, A.; Böttcher, M.; Agudo, I.; Angüner, E.O.; Alfaro, R. (Elsevier, 2019)
      The Cherenkov Telescope Array (CTA) is the major next-generation observatory for ground-based very-high-energy gamma-ray astronomy. It will improve the sensitivity of current ground-based instruments by a factor of five ...

    • Production of secondary particles in heavy nuclei interactions in supernova remnants 

      Bhatt, Maulik; Sushch, Iurii; Pohl, Martin; Fedynitch, Anatoli; Das, Samata (Elsevier, 2020)
      Depending on their type, supernova remnants may have ejecta material with high abundance of heavy elements such as carbon or oxygen. In addition, core-collapse supernovae explode in the wind material of their progenitor ...

    • Pulsars – Extreme Cosmic Lighthouses / Christo Venter 

      Venter, Christo (North-West University (South Africa). Potchefstroom, 2018)
      Pulsars are ancient, fast-rotating, highly-magnetised neutron stars that radiate across the electromagnetic spectrum. New discoveries by the Fermi Large Area Telescope (LAT) in the gamma-ray band since 2008, combined with ...

    • Search for dark matter annihilations towards the inner Galactic halo from 10 years of observations with H.E.S.S. 

      Abdallah, H.; Barnard, M.; Böttcher, M.; Davids, I.D.; Garrigoux, T.; Ivascenko, A.; Krüger, P.P.; Pekeur, N.W.; Seyffert, A.S.; Spanier, F.; Van der Walt, D.J.; Venter, C.; H.E.S.S. Collaboration (APS, 2016)
      The inner region of the Milky Way halo harbors a large amount of dark matter (DM). Given its proximity, it is one of the most promising targets to look for DM. We report on a search for the annihilations of DM particles ...

    • Spatially-dependent multi-wavelength modeling of pulsar wind nebulae 

      Van Rensburg, Carlo (North-West University (South Africa), Potchefstroom Campus, 2020)
      The next era of ground-based Cherenkov telescope development will see a great increase in both quantity and quality of γ-ray morphological data. This initiated the development of a spatio-temporal leptonic transport code ...

    • Spectral modelling of H.E.S.S.- detected pulsar wind nebulae 

      Van Rensburg, Carlo (North-West University (South Africa), 2016)
      In the last decade, ground-based Imaging Atmospheric Cherenkov Telescopes have discovered about 175 very-high-energy (VHE; E > 100 GeV) gamma-ray sources, with more to follow with the development of H.E.S.S. II and CTA. ...