• The AUSTRAL VLBI Observing Program

      Weston, S; Plank, L; Lovell, J; McCallum, J; Mayer, D; Reynolds, C; Quick, J; Weston, S; Titov, O; Shabala, S; Bohm, J; Natusch, T; Nickola, M; Gulyaev, S (Springer Journals, 2016)
      The AUSTRAL observing program was started in 2011, performing geodetic and astrometric very long baseline interferometry (VLBI) sessions using the new Australian AuScope VLBI antennas at Hobart, Katherine, and Yarragadee, ...
    • Automated Cross-identifying Radio to Infra-red Surveys Using the LRPY Algorithm: A Case Study

      Weston, S; Seymour, N; Gulyaev, S; Norris, RP; Banfield, J; Vaccari, M; Hopkins, AM; Franzen, TMO (Oxford University Press (OUP), 2017)
      Cross-identifying complex radio sources with optical or infra red (IR) counterparts in surveys such as the Australia Telescope Large Area Survey (ATLAS) has tradi- tionally been performed manually. However, with new surveys ...
    • Contribution of Warkworth 12m VLBI radio telescope to New Zealand geodesy

      Takiguchi, H; Gulyaev, S; Natusch, T; Weston, S; Woodburn, L (The Geoscience Society of New Zealand, 2011)
      The Institute for Radio Astronomy and Space Research (IRASR) of Auckland University of Technology (AUT) launched the New Zealand's first and only research capable radio telescope (WARK12M) near Warkworth which is located ...
    • Conversion of New Zealand's 30m telecommunication antenna into a radio telescope

      Woodburn, L; Natusch, T; Weston, S; Thomasson, P; Godwin, M; Gulyaev, S (Astronomical Society of Australia, 2014)
      We describe our approach to the conversion of a former 100-foot (30-m) telecommunication antenna in New Zealand into a radio telescope. We provide the specifications of the Earth Station and identify the priorities for the ...
    • Design of an X-Band Feed System for the Auckland University of Technology 30m Diameter Warkworth Radio Telescope

      Granet, C; Kot, JS; Natusch, T; Weston, S; Gulyaev, S (IEEE, 2017)
      An innovative way to nest a new X-band feed system inside an existing C-band feed system is proposed.
    • Expanding New Zealand VLBI capability and the 30m dish

      Weston, S (Joint Institute for VLBI in Europe (JIVE), 2014)
      We describe our current VLBI activities with the 12m dish; but also with the conversion of a former 100-foot (30-m) telecommunication antenna in New Zealand into a radio telescope show the future capabilities. Provide a ...
    • First Scientific VLBI Observations Using New Zealand 30 Metre Radio Telescope Wark30m

      Petrov, L; Natusch, T; Weston, S; McCallum, J; Ellingsen, S; Gulyaev, S (IOP Publishing, 2015)
      We report the results of a successful 24 hour 6.7 GHz VLBI experiment using the 30 meter radio telescope WARK30M near Warkworth, New Zealand, recently converted from a radio telecommunications antenna, and two radio ...
    • Gamma-ray Emission in Radio Galaxies Under the VLBI Scope II. The Relationship Between Gamma-ray Emission and Parsec-scale Jets in Radio Galaxies

      Weston, S; Gulyaev, S; Natusch, T (EDP Sciences, 2020)
      Aims. This is the second paper in our series studying the evolution of parsec-scale radio emission in radio galaxies in the southern hemisphere. Following our study of the radio and high-energy properties of γ-ray-emitting ...
    • The GLEAM 4-Jy (G4Jy) Sample: II. Host Galaxy Identification for Individual Sources

      White, SV; Franzen, TMO; Riseley, CJ; Ivy Wong, O; Kapińska, AD; Hurley-Walker, N; Callingham, JR; Thorat, K; Wu, C; Hancock, P; Hunstead, RW; Seymour, N; Swan, J; Wayth, R; Morgan, J; Chhetri, R; Jackson, C; Weston, S; Bell, M; Gaensler, BM; Johnston-Hollitt, M; Offringa, A; Staveley-Smith, L (Cambridge University Press, 2020)
      The entire southern sky (Declination, d < 30°) has been observed using the Murchison Widefield Array (MWA), which provides radio imaging of ~2 arcmin resolution at low frequencies (72 231 MHz). This is the GaLactic and ...
    • The MWA GLEAM 4-Jy (G4Jy) Sample

      White, SV; Franzen, TMO; Wong, OI; Kapinska, AD; Riseley, C; Hancock, P; Callingham, J; Hunstead, R; Hurley-Walker, N; Wu, C; Seymour, N; Swan, J; Wayth, R; Morgan, JS; Chhetri, R; Jackson, C; Weston, S; Mauch, T
      Powerful radio-galaxies feature heavily in our understanding of galaxy evolution. However, when it comes to studying their properties as a function of redshift and/or environment, the most-detailed studies tend to be limited ...
    • Planetary Radio Interferometry and Doppler Experiment (PRIDE) Technique: A Test Case of the Mars Express Phobos Fly-by

      Gulyaev, S; Natusch, T; Weston, S (ESO, 2016)
      Context. The closest ever fly-by of the Martian moon Phobos, performed by the European Space Agency’s Mars Express spacecraft, gives a unique opportunity to sharpen and test the Planetary Radio Interferometry and Doppler ...
    • Potential Kick Velocity Distribution of Black Hole X-ray Binaries and Implications for Natal Kicks

      Atri, P; Miller-Jones, JCA; Bahramian, A; Plotkin, RM; Jonker, PG; Nelemans, G; Maccarone, TJ; Sivakoff, GR; Deller, AT; Chaty, S; Torres, MAP; Horiuchi, S; McCallum, J; Natusch, T; Phillips, CJ; Stevens, J; Weston, S
      We use Very Long Baseline Interferometry to measure the proper motions of three black hole X-ray binaries (BHXBs). Using these results together with data from the literature and Gaia-DR2 to collate the best available ...
    • Results from the Regional AUSTRAL VLBI Sessions for Southern Hemisphere Reference Frames

      plank, L; Lovell, J; Bohm, J; Mayer, D; McCullum, J; Rastorgueva-Fio, E; Shabala, S; Sun, J; Titov, O; Weston, S; Quick, J (The University of Luxembourg, 2014)
      Since late 2011, more than 40 dedicated AUSTRAL VLBI sessions have been undertaken with the aim to strengthen the terrestrial and celestial reference frame in the southern hemisphere. In this program, the three 12-m antennas ...
    • Spica and the Annual Cycle of PKS B1322-110 Scintillations

      Bignall, H; Reynolds, C; Stevens, J; Bannister, K; Johnston, S; Tuntsov, AV; Walker, MA; Gulyaev, S; Natusch, T; Weston, S; Md Said, NM; Kratzer, M (Oxford University Press (OUP), 2019)
      PKS B1322–110 is a radio quasar that is located only 8.′5 in angular separation from the bright B star Spica. It exhibits intraday variability in its flux density at GHz frequencies attributed to scintillations from plasma ...
    • The TANAMI Multiwavelength Program: Dynamic SEDs of Southern Blazars

      Krauß, F; Wilms, J; Kadler, M; Ojha, R; Schulz, R; Trüstedt, J; Edwards, PG; Stevens, J; Ros, E; Baumgartner, W; Beuchert, T; Blanchard, J; Buson, S; Carpenter, B; Dauser, T; Falkner, S; Gehrels, N; Gräfe, C; Gulyaev, S; Hase, H; Horiuchi, S; Kreikenbohm, A; Kreykenbohm, I; Langejahn, M; Leiter, K; Lovell, JEJ; Müller, C; Natusch, T; Nesci, R; Pursimo, T; Phillips, C; Plötz, C; Quick, J; Tzioumis, AK; Weston, S (EDP Sciences, 2016)
      Context. Simultaneous broadband spectral and temporal studies of blazars are an important tool for investigating active galactic nuclei (AGN) jet physics. Aims. We study the spectral evolution between quiescent and flaring ...
    • TANAMI: Tracking Active Galactic Nuclei with Austral Milliarcsecond Interferometry - II. Additional Sources

      Muller, C; Kadler, M; Ojha, R; Schulz, R; Trustedt, J; Edwards, PG; Ros, E; Carpenter, B; Angioni, R; Blanchard, J; Bock, M; Burd, PR; Dorr, M; Dutka, MS; Eberl, T; Gulyaev, S; Hase, H; Horiuchi, S; Katz, U; Krauss, F; Lovell, JEJ; Natusch, T; Nesci, R; Phillips, C; Plotz, C; Pursimo, T; Quick, JFH; Stevens, J; Thompson, DJ; Tingay, SJ; Tzioumis, AK; Weston, S; Wilms, J; Zensus, JA (EDP Sciences, 2017)
      Context. TANAMI is a multiwavelength program monitoring active galactic nuclei (AGN) south of −30◦ declination including highresolution Very Long Baseline Interferometry (VLBI) imaging, radio, optical/UV, X-ray and γ-ray ...
    • Towards synergy of VLBI and GNSS geodetic techniques in geologically dynamic New Zealand

      Takiguchi, H; Gulyaev, S; Natusch, T; Weston, S; Woodburn, L (Asia Oceania Geosciences Society (AOGS), 2011)
      Though the New Zealand Geodetic Datum 2000 (NZGD2000) is based on and closely matches the International Terrestrial Reference System (ITRS) through the International Terrestrial Reference Frame (ITRF), it is not a dynamic ...
    • Warkworth 12-m VLBI Station: WARK12M

      Gulyaev, S; Natusch, T; Weston, S; Collett, D; Palmer, N (AUT University; NASA Technical Publication, 2011)
      This report summarizes the geodetic VLBI activities in New Zealand in 2010. It provides geographical and technical details of WARK12M - the new IVS network station operated by the Institute for Radio Astronomy and Space ...