Now showing items 1-10 of 15

    • Chandra and HESS observations of the supernova remnant CTB 37B 

      Aharonian, F.; Büsching, I.; De Jager, O.C.; Holleran, M.; Raubenheimer, B.C.; Venter, C. (EDP Sciences, 2008)
      We discovered the >100 GeV γ-ray source, HESS J1713−381, apparently associated with the shell-type supernova remnant (SNR) CTB37B, using HESS in 2006. In 2007 we performed X-ray follow-up observations with Chandra with ...
    • Discovery of gamma-ray emission from the extragalactic pulsar wind nebula N 157B with H.E.S.S 

      Abramowski, A.; Casanova, S.; De Jager, O.C.; Pekeur, N.W.; Sheidaei, F.; Venter, C.; Vorster, M. (EDP Sciences, 2012)
      We present the significant detection of the first extragalactic pulsar wind nebula (PWN) detected in gamma rays, N 157B, located in the large Magellanic Cloud (LMC). Pulsars with high spin-down luminosity are found to power ...
    • The effect of diffusion on the particle spectra in pulsar wind nebulae 

      Vorster, M.J.; Moraal, H. (IOP Publishing, 2013)
      A possible way to calculate particle spectra as a function of position in pulsar wind nebulae is to solve a Fokker–Planck transport equation. This paper presents numerical solutions to the transport equation with the ...
    • The effect of drift on the evolution of the electron/positron spectra in an axisymmetric pulsar wind nebula 

      Vorster, Michael J.; Moraal, Harm (IOP Publishing, 2014)
      Charged particles propagating through a structured magnetic field are subject to drift motion. The primary aim of the present paper is therefore to investigate the effects of gradient, curvature, and neutral sheet drift ...
    • H.E.S.S. detection of TeV emission from the interaction region between the supernova remnant G349.7+0.2 and a molecular cloud 

      Abramowski, A.; Böttcher, M.; Davids, I.D.; Ivascenko, A.; Krüger, P.P.; Pekeur, N.W.; Spanier, F.; Sushch, I.; Venter, C.; Vorster, M. (EDP Sciences, 2015)
      G349.7+0.2 is a young Galactic supernova remnant (SNR) located at the distance of 11.5 kpc and observed across the entire electromagnetic spectrum from radio to high energy (HE; 0.1 GeV <E< 100 GeV) γ-rays. Radio and ...
    • HESS J1640-465: an exceptionally luminous TeV γ-ray supernova remnant 

      Abramowski, A.; Casanova, S.; Davids, I.D.; Krüger, P.P.; Pekeur, N.W.; Sushch, I.; Venter, C.; Vorster, M.; Böttcher, M. (Oxford Univ Press, 2014)
      The results of follow-up observations of the TeV γ-ray source HESS J1640−465 from 2004 to 2011 with the High Energy Stereoscopic System (HESS) are reported in this work. The spectrum is well described by an exponential ...
    • HESS upper limits for Kepler's supernova remnant 

      Büsching, I.; De Jager, O.C.; Holleran, M.; Raubenheimer, B.C.; Venter, C. (EDP sciences, 2008)
      Aims. Observations of Kepler's supernova remnant (G4.5+6.8) with the HESS telescope array in 2004 and 2005 with a total live time of 13 h are presented. Methods. Stereoscopic imaging of Cherenkov radiation from extensive ...
    • Modelling of the radio emission from the Vela supernova remnant 

      Sushch, I.; Hnatyk, B. (EDP Sciences, 2014)
      Supernova remnants (SNRs) are widely considered to be sites of Galactic cosmic ray (CR) acceleration. Vela is one of the Galactic composite SNRs closest to Earth accompanied by the Vela pulsar and its pulsar wind nebula ...
    • A new SNR with TeV shell-type morphology: HESS J1731-347 

      Abramowski, A.; Büsching, I.; De Jager, O.C.; Venter, C.; Vorster, M. (EDP Sciences, 2011)
      Aims. The recent discovery of the radio shell-type supernova remnant (SNR), G353.6-0.7, in spatial coincidence with the unidentified TeV source HESS J1731−347 has motivated further observations of the source with the High ...
    • Numerical simulations of composite supernova remnants for small σ pulsar wind nebulae 

      Vorster, M.J.; Ferreira, S.E.S.; De Jager, O.C.; Djannati-Ataï, A. (EDP Sciences, 2013)
      Context. Composite supernova remnants consist of a pulsar wind nebula located inside a shell-type remnant. The presence of a shell has implications on the evolution of the nebula, although the converse is generally not ...