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Now showing items 1-10 of 11

    • Discovery of periodic class II methanol masers associated with G339.986−0.425 region 

      Maswanganye, J.P.; Van der Walt, D.J.; Goedhart, S.; Gaylard, M.J. (Oxford Univ Press, 2016)
      10 new class II methanol masers from the 6.7-GHz Methanol Multibeam survey catalogues III and IV were selected for a monitoring programme at both 6.7 and 12.2 GHz with the 26-m Hartebeesthoek Radio Astronomy Observatory ...
    • 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.; H.E.S.S. Collaboration (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 J1741-302: a hidden accelerator in the Galactic plane 

      Abdalla, H.; Barnard, M.; Böttcher, M.; Garrigoux, T.; Ivascenko, A.; Krüger, P.P.; Pekeur, N.W.; Seyffert, A.S.; Spanier, F.; Sushch, I.; Van der Walt, D.J.; Van Rensburg, C.; Venter, C.; Wadiasingh, Z.; Zacharias, M.; H.E.S.S. Collaboration (EDP Sciences, 2018)
      The H.E.S.S. Collaboration has discovered a new very high energy (VHE, E > 0.1 TeV) γ-ray source, HESS J1741−302, located in the Galactic plane. Despite several attempts to constrain its nature, no plausible counterpart ...
    • 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 ...
    • New periodic 6.7 GHz class II methanol maser associated with G358.460−0.391 

      Maswanganye, J.P.; Goedhart, S.; Van der Walt, D.J.; Booth, R.S.; Gaylard, M.J. (Oxford Univ Press, 2015)
      Eight new class II methanol masers selected from the 6.7 GHz Methanol Multibeam survey catalogues I and II were monitored at 6.7 GHz with the 26 m Hartebeesthoek Radio Astronomy Observatory radio telescope for three years ...
    • Periodic class II methanol masers in G9.62+0.20E 

      Van der Walt, D.J.; Goedhart, S.; Gaylard, M.J. (Oxford Univ Press, 2009)
      We present the light curves of the 6.7 and 12.2 GHz methanol masers in the star-forming region G9.62+0.20E for a time-span of more than 2600 d. The earlier reported period of 244 d is confirmed. The results of monitoring ...
    • Periodic variability of the mainline hydroxyl masers in G9.62+0.20E 

      Goedhart, S.; Van Rooyen, R.; Van der Walt, D.J.; Maswanganye, J.P.; Sanna, A. (Oxford Univ Press, 2019)
      We present the results of a monitoring campaign using the KAT-7 and HartRAO 26 m telescopes, of hydroxyl, methanol, and water vapour masers associated with the high-mass star-forming region G9.62+0.20E. Periodic flaring ...
    • Periodicity in Class II methanol masers in high-mass star-forming regions 

      Goedhart, S.; Maswanganye, J.P.; Van der Walt, D.J.; Gaylard, M.J. (Oxford Univ Press, 2014)
      We report the results of 10 years of monitoring of six regularly varying 6.7 GHz methanol masers using the Hartebeesthoek 26-m telescope. Observations were done at intervals of 1–2 weeks, with faster sampling during ...
    • Probing the gamma-ray emission from HESS J1834-087 using H.E.S.S. and Fermi LAT observations 

      Abramowski, A.; Böttcher, M.; Casanova, S.; Davids, I.D.; Krüger, P.P.; Pekeur, N.W.; Sushch, I.; Venter, C.; Vorster, M.; H.E.S.S. Collaboration (EDP Sciences, 2015)
      Aims: Previous observations with the High Energy Stereoscopic System (H.E.S.S.) have revealed an extended very-high-energy (VHE; E> 100 GeV) γ-ray source, HESS J1834−087, coincident with the supernova remnant (SNR) W41. ...
    • Short-period variability in the Class II methanol maser source G12.89+0.49 (IRAS 18089-1732) 

      Goedhart, S.; Langa, M.C.; Van der Walt, D.J.; Gaylard, M.J. (Oxford Univ Press, 2009)
      Time series are presented for the Class II methanol maser source G12.89+0.49, which has been monitored for nine years at the Hartebeesthoek Radio Astronomy Observatory. The 12.2 and 6.7 GHz methanol masers were seen to ...