Browsing Faculty of Natural and Agricultural Sciences by Subject "Radio lines: ISM"

Now showing items 1-7 of 7

    • Detection of new methanol maser transitions associated with G358.93−0.03 

      Macleod, G.C.; Chibueze, J.O.; Sugiyama, K.; Hunter, T.R.; Quick, J. (Oxford Univ Press, 2019)
      We report the detection of new 12.178, 12.229, 20.347, and 23.121 GHz methanol masers in the massive star-forming region G358.93−0.03, which are flaring on similarly short time-scales (days) as the 6.668 GHz methanol masers ...

    • 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 ...

    • A masing event in NGC 6334I: contemporaneous flaring of hydroxyl, methanol, and water masers 

      MacLeod, G.C.; Chibueze, J.O.; Thesner, C.J.; Smits, D.P.; Goedhart, S. (Oxford Univ Press, 2018)
      As a product of the maser monitoring program with the 26 m telescope of the Hartebeesthoek Radio Astronomy Observatory (HartRAO), we present an unprecedented, contemporaneous flaring event of 10 maser transitions in hydroxyl, ...

    • 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 methanol masers: from a colliding wind binary (CWB) perspective 

      Van den Heever, S.P.; Van der Walt, D.J.; Pittard, J.M.; Hoare, M.G. (Oxford Univ Press, 2019)
      Since the discovery of periodic class II methanol masers at 6.7 and 12.2 GHz associated with high-mass star formation regions (HMSFRs), a number of possible driving mechanisms have been proposed to explain this phenomenon. ...

    • 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 ...

    • 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 ...