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Heywood I, Camilo F, Cotton WD, Yusef-Zadeh F, Abbott TD, Adam RM, Aldera MA, Bauermeister EF, Booth RS, Botha AG, Botha DH, Brederode LRS, Brits ZB, Buchner SJ, Burger JP, Chalmers JM, Cheetham T, de Villiers D, Dikgale-Mahlakoana MA, du Toit LJ, Esterhuyse SWP, Fanaroff BL, Foley AR, Fourie DJ, Gamatham RRG, Goedhart S, Gounden S, Hlakola MJ, Hoek CJ, Hokwana A, Horn DM, Horrell JMG, Hugo B, Isaacson AR, Jonas JL, Jordaan JDBL, Joubert AF, Józsa GIG, Julie RPM, Kapp FB, Kenyon JS, Kotzé PPA, Kriel H, Kusel TW, Lehmensiek R, Liebenberg D, Loots A, Lord RT, Lunsky BM, Macfarlane PS, Magnus LG, Magozore CM, Mahgoub O, Main JPL, Malan JA, Malgas RD, Manley JR, Maree MDJ, Merry B, Millenaar R, Mnyandu N, Moeng IPT, Monama TE, Mphego MC, New WS, Ngcebetsha B, Oozeer N, Otto AJ, Passmoor SS, Patel AA, Peens-Hough A, Perkins SJ, Ratcliffe SM, Renil R, Rust A, Salie S, Schwardt LC, Serylak M, Siebrits R, Sirothia SK, Smirnov OM, Sofeya L, Swart PS, Tasse C, Taylor DT, Theron IP, Thorat K, Tiplady AJ, Tshongweni S, van Balla TJ, van der Byl A, van der Merwe C, van Dyk CL, Van Rooyen R, Van Tonder V, Van Wyk R, Wallace BH, Welz MG, Williams LP. Inflation of 430-parsec bipolar radio bubbles in the Galactic Centre by an energetic event. Nature 2019; 573:235-237. [PMID: 31511683 DOI: 10.1038/s41586-019-1532-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2019] [Accepted: 06/28/2019] [Indexed: 11/09/2022]
Abstract
The Galactic Centre contains a supermassive black hole with a mass of four million Suns1 within an environment that differs markedly from that of the Galactic disk. Although the black hole is essentially quiescent in the broader context of active galactic nuclei, X-ray observations have provided evidence for energetic outbursts from its surroundings2. Also, although the levels of star formation in the Galactic Centre have been approximately constant over the past few hundred million years, there is evidence of increased short-duration bursts3, strongly influenced by the interaction of the black hole with the enhanced gas density present within the ring-like central molecular zone4 at Galactic longitude |l| < 0.7 degrees and latitude |b| < 0.2 degrees. The inner 200-parsec region is characterized by large amounts of warm molecular gas5, a high cosmic-ray ionization rate6, unusual gas chemistry, enhanced synchrotron emission7,8, and a multitude of radio-emitting magnetized filaments9, the origin of which has not been established. Here we report radio imaging that reveals a bipolar bubble structure, with an overall span of 1 degree by 3 degrees (140 parsecs × 430 parsecs), extending above and below the Galactic plane and apparently associated with the Galactic Centre. The structure is edge-brightened and bounded, with symmetry implying creation by an energetic event in the Galactic Centre. We estimate the age of the bubbles to be a few million years, with a total energy of 7 × 1052 ergs. We postulate that the progenitor event was a major contributor to the increased cosmic-ray density in the Galactic Centre, and is in turn the principal source of the relativistic particles required to power the synchrotron emission of the radio filaments within and in the vicinity of the bubble cavities.
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Affiliation(s)
- I Heywood
- Department of Physics, University of Oxford, Oxford, UK. .,Department of Physics and Electronics, Rhodes University, Grahamstown, South Africa. .,South African Radio Astronomy Observatory, Cape Town, South Africa.
| | - F Camilo
- South African Radio Astronomy Observatory, Cape Town, South Africa.
| | - W D Cotton
- South African Radio Astronomy Observatory, Cape Town, South Africa.,National Radio Astronomy Observatory, Charlottesville, VA, USA
| | - F Yusef-Zadeh
- CIERA and Department of Physics and Astronomy, Northwestern University, Evanston, IL, USA
| | - T D Abbott
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - R M Adam
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - M A Aldera
- Tellumat (Pty) Ltd, Retreat, South Africa
| | - E F Bauermeister
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - R S Booth
- Chalmers University of Technology, Gothenburg, Sweden
| | - A G Botha
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - D H Botha
- EMSS Antennas (Pty) Ltd, Stellenbosch, South Africa
| | - L R S Brederode
- South African Radio Astronomy Observatory, Cape Town, South Africa.,SKA Organisation, Jodrell Bank, Macclesfield, UK
| | - Z B Brits
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - S J Buchner
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - J P Burger
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - J M Chalmers
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - T Cheetham
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - D de Villiers
- Department of Electrical and Electronic Engineering, Stellenbosch University, Stellenbosch, South Africa
| | | | - L J du Toit
- EMSS Antennas (Pty) Ltd, Stellenbosch, South Africa
| | - S W P Esterhuyse
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - B L Fanaroff
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - A R Foley
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - D J Fourie
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - R R G Gamatham
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - S Goedhart
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - S Gounden
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - M J Hlakola
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - C J Hoek
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - A Hokwana
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - D M Horn
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - J M G Horrell
- IDIA, University of Cape Town, Rondebosch, South Africa
| | - B Hugo
- Department of Physics and Electronics, Rhodes University, Grahamstown, South Africa.,South African Radio Astronomy Observatory, Cape Town, South Africa
| | - A R Isaacson
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - J L Jonas
- Department of Physics and Electronics, Rhodes University, Grahamstown, South Africa.,South African Radio Astronomy Observatory, Cape Town, South Africa
| | - J D B L Jordaan
- South African Radio Astronomy Observatory, Cape Town, South Africa.,EMSS Antennas (Pty) Ltd, Stellenbosch, South Africa
| | - A F Joubert
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - G I G Józsa
- Department of Physics and Electronics, Rhodes University, Grahamstown, South Africa.,South African Radio Astronomy Observatory, Cape Town, South Africa
| | - R P M Julie
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - F B Kapp
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - J S Kenyon
- Department of Physics and Electronics, Rhodes University, Grahamstown, South Africa
| | - P P A Kotzé
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - H Kriel
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - T W Kusel
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - R Lehmensiek
- EMSS Antennas (Pty) Ltd, Stellenbosch, South Africa.,Department of Electrical Engineering, Cape Peninsula University of Technology, Bellville, South Africa
| | - D Liebenberg
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - A Loots
- Presidential Infrastructure Coordinating Commission, Pretoria, South Africa
| | - R T Lord
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - B M Lunsky
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - P S Macfarlane
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - L G Magnus
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - C M Magozore
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - O Mahgoub
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - J P L Main
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - J A Malan
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - R D Malgas
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - J R Manley
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - M D J Maree
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - B Merry
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - R Millenaar
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - N Mnyandu
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - I P T Moeng
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - T E Monama
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - M C Mphego
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - W S New
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - B Ngcebetsha
- Department of Physics and Electronics, Rhodes University, Grahamstown, South Africa.,South African Radio Astronomy Observatory, Cape Town, South Africa
| | - N Oozeer
- South African Radio Astronomy Observatory, Cape Town, South Africa.,African Institute for Mathematical Sciences, Muizenberg, South Africa
| | - A J Otto
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - S S Passmoor
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - A A Patel
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - A Peens-Hough
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - S J Perkins
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - S M Ratcliffe
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - R Renil
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - A Rust
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - S Salie
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - L C Schwardt
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - M Serylak
- South African Radio Astronomy Observatory, Cape Town, South Africa.,Department of Physics and Astronomy, University of the Western Cape, Bellville, South Africa
| | - R Siebrits
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - S K Sirothia
- Department of Physics and Electronics, Rhodes University, Grahamstown, South Africa.,South African Radio Astronomy Observatory, Cape Town, South Africa
| | - O M Smirnov
- Department of Physics and Electronics, Rhodes University, Grahamstown, South Africa.,South African Radio Astronomy Observatory, Cape Town, South Africa
| | - L Sofeya
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - P S Swart
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - C Tasse
- Department of Physics and Electronics, Rhodes University, Grahamstown, South Africa.,GEPI, CNRS, PSL Research University, Meudon, France
| | - D T Taylor
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - I P Theron
- Department of Physics and Electronics, Rhodes University, Grahamstown, South Africa.,EMSS Antennas (Pty) Ltd, Stellenbosch, South Africa
| | - K Thorat
- Department of Physics and Electronics, Rhodes University, Grahamstown, South Africa.,South African Radio Astronomy Observatory, Cape Town, South Africa
| | - A J Tiplady
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - S Tshongweni
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - T J van Balla
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - A van der Byl
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - C van der Merwe
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - C L van Dyk
- Peralex Electronics (Pty) Ltd, Bergvliet, South Africa
| | - R Van Rooyen
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - V Van Tonder
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - R Van Wyk
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - B H Wallace
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - M G Welz
- South African Radio Astronomy Observatory, Cape Town, South Africa
| | - L P Williams
- South African Radio Astronomy Observatory, Cape Town, South Africa
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2
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Schellart P, Trinh TNG, Buitink S, Corstanje A, Enriquez JE, Falcke H, Hörandel JR, Nelles A, Rachen JP, Rossetto L, Scholten O, Ter Veen S, Thoudam S, Ebert U, Koehn C, Rutjes C, Alexov A, Anderson JM, Avruch IM, Bentum MJ, Bernardi G, Best P, Bonafede A, Breitling F, Broderick JW, Brüggen M, Butcher HR, Ciardi B, de Geus E, de Vos M, Duscha S, Eislöffel J, Fallows RA, Frieswijk W, Garrett MA, Grießmeier J, Gunst AW, Heald G, Hessels JWT, Hoeft M, Holties HA, Juette E, Kondratiev VI, Kuniyoshi M, Kuper G, Mann G, McFadden R, McKay-Bukowski D, McKean JP, Mevius M, Moldon J, Norden MJ, Orru E, Paas H, Pandey-Pommier M, Pizzo R, Polatidis AG, Reich W, Röttgering H, Scaife AMM, Schwarz DJ, Serylak M, Smirnov O, Steinmetz M, Swinbank J, Tagger M, Tasse C, Toribio MC, van Weeren RJ, Vermeulen R, Vocks C, Wise MW, Wucknitz O, Zarka P. Probing Atmospheric Electric Fields in Thunderstorms through Radio Emission from Cosmic-Ray-Induced Air Showers. Phys Rev Lett 2015; 114:165001. [PMID: 25955053 DOI: 10.1103/physrevlett.114.165001] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2015] [Indexed: 06/04/2023]
Abstract
We present measurements of radio emission from cosmic ray air showers that took place during thunderstorms. The intensity and polarization patterns of these air showers are radically different from those measured during fair-weather conditions. With the use of a simple two-layer model for the atmospheric electric field, these patterns can be well reproduced by state-of-the-art simulation codes. This in turn provides a novel way to study atmospheric electric fields.
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Affiliation(s)
- P Schellart
- Department of Astrophysics/IMAPP, Radboud University Nijmegen, PO Box 9010, 6500 GL Nijmegen, The Netherlands
| | - T N G Trinh
- University of Groningen, KVI Center for Advanced Radiation Technology, 9700 AB Groningen, The Netherlands
| | - S Buitink
- Department of Astrophysics/IMAPP, Radboud University Nijmegen, PO Box 9010, 6500 GL Nijmegen, The Netherlands
- Astrophysical Institute, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium
| | - A Corstanje
- Department of Astrophysics/IMAPP, Radboud University Nijmegen, PO Box 9010, 6500 GL Nijmegen, The Netherlands
| | - J E Enriquez
- Department of Astrophysics/IMAPP, Radboud University Nijmegen, PO Box 9010, 6500 GL Nijmegen, The Netherlands
| | - H Falcke
- Department of Astrophysics/IMAPP, Radboud University Nijmegen, PO Box 9010, 6500 GL Nijmegen, The Netherlands
- Nikhef, Science Park Amsterdam, 1098 XG Amsterdam, The Netherlands
- ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands
- Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
| | - J R Hörandel
- Department of Astrophysics/IMAPP, Radboud University Nijmegen, PO Box 9010, 6500 GL Nijmegen, The Netherlands
- Nikhef, Science Park Amsterdam, 1098 XG Amsterdam, The Netherlands
| | - A Nelles
- Department of Astrophysics/IMAPP, Radboud University Nijmegen, PO Box 9010, 6500 GL Nijmegen, The Netherlands
| | - J P Rachen
- Department of Astrophysics/IMAPP, Radboud University Nijmegen, PO Box 9010, 6500 GL Nijmegen, The Netherlands
| | - L Rossetto
- Department of Astrophysics/IMAPP, Radboud University Nijmegen, PO Box 9010, 6500 GL Nijmegen, The Netherlands
| | - O Scholten
- University of Groningen, KVI Center for Advanced Radiation Technology, 9700 AB Groningen, The Netherlands
- Vrije Universiteit Brussel, Dienst ELEM, B-1050 Brussels, Belgium
| | - S Ter Veen
- Department of Astrophysics/IMAPP, Radboud University Nijmegen, PO Box 9010, 6500 GL Nijmegen, The Netherlands
- ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands
| | - S Thoudam
- Department of Astrophysics/IMAPP, Radboud University Nijmegen, PO Box 9010, 6500 GL Nijmegen, The Netherlands
| | - U Ebert
- Center for Mathematics and Computer Science (CWI), PO Box 94079, 1090 GB Amsterdam, The Netherlands
- Eindhoven University of Technology (TU/e), PO Box 513, 5600 MB Eindhoven, The Netherlands
| | - C Koehn
- Center for Mathematics and Computer Science (CWI), PO Box 94079, 1090 GB Amsterdam, The Netherlands
| | - C Rutjes
- Center for Mathematics and Computer Science (CWI), PO Box 94079, 1090 GB Amsterdam, The Netherlands
| | - A Alexov
- Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, Maryland 21218, USA
| | - J M Anderson
- Helmholtz-Zentrum Potsdam, DeutschesGeoForschungsZentrum GFZ, Department 1: Geodesy and Remote Sensing, Telegrafenberg, A17, 14473 Potsdam, Germany
| | - I M Avruch
- SRON Netherlands Institute for Space Research, PO Box 800, 9700 AV Groningen, The Netherlands
- Kapteyn Astronomical Institute, PO Box 800, 9700 AV Groningen, The Netherlands
| | - M J Bentum
- ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands
- University of Twente, PO Box 217, 7500 AE Enschede, The Netherlands
| | - G Bernardi
- Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138, USA
| | - P Best
- Institute for Astronomy, University of Edinburgh, Royal Observatory of Edinburgh, Blackford Hill, Edinburgh EH9 3HJ, United Kingdom
| | - A Bonafede
- University of Hamburg, Gojenbergsweg 112, 21029 Hamburg, Germany
| | - F Breitling
- Leibniz-Institut für Astrophysik Potsdam (AIP), An der Sternwarte 16, 14482 Potsdam, Germany
| | - J W Broderick
- Astrophysics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, United Kingdom
- School of Physics and Astronomy, University of Southampton, Southampton SO17 1BJ, United Kingdom
| | - M Brüggen
- University of Hamburg, Gojenbergsweg 112, 21029 Hamburg, Germany
| | - H R Butcher
- Research School of Astronomy and Astrophysics, Australian National University, Mt. Stromlo Observatory, via Cotter Road, Weston, Australian Capital Territory 2611, Australia
| | - B Ciardi
- Max Planck Institute for Astrophysics, Karl Schwarzschild Straße 1, 85741 Garching, Germany
| | - E de Geus
- ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands
- SmarterVision BV, Oostersingel 5, 9401 JX Assen, The Netherlands
| | - M de Vos
- ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands
| | - S Duscha
- ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands
| | - J Eislöffel
- Thüringer Landessternwarte, Sternwarte 5, D-07778 Tautenburg, Germany
| | - R A Fallows
- ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands
| | - W Frieswijk
- ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands
| | - M A Garrett
- ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands
- Leiden Observatory, Leiden University, PO Box 9513, 2300 RA Leiden, The Netherlands
| | - J Grießmeier
- LPC2E, Universíte d'Orleans/CNRS, 45071 Orleans Cedex 2, France
- Station de Radioastronomie de Nancay, Observatoire de Paris, CNRS/INSU, USR 704, Universíte Orleans, OSUC, Route de Souesmes, 18330 Nancay, France
| | - A W Gunst
- ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands
| | - G Heald
- ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands
- Kapteyn Astronomical Institute, PO Box 800, 9700 AV Groningen, The Netherlands
| | - J W T Hessels
- ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands
- Anton Pannekoek Institute, University of Amsterdam, Postbus 94249, 1090 GE Amsterdam, The Netherlands
| | - M Hoeft
- Thüringer Landessternwarte, Sternwarte 5, D-07778 Tautenburg, Germany
| | - H A Holties
- ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands
| | - E Juette
- Astronomisches Institut der Ruhr-Universität Bochum, Universitaetsstrasse 150, 44780 Bochum, Germany
| | - V I Kondratiev
- ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands
- Astro Space Center of the Lebedev Physical Institute, Profsoyuznaya Street 84/32, Moscow 117997, Russia
| | - M Kuniyoshi
- National Astronomical Observatory of Japan, Tokyo 181-8588, Japan
| | - G Kuper
- ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands
| | - G Mann
- Leibniz-Institut für Astrophysik Potsdam (AIP), An der Sternwarte 16, 14482 Potsdam, Germany
| | - R McFadden
- ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands
| | - D McKay-Bukowski
- Sodankylä Geophysical Observatory, University of Oulu, Tähteläntie 62, 99600 Sodankylä, Finland
- STFC Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Didcot OX11 0QX, United Kingdom
| | - J P McKean
- ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands
- Kapteyn Astronomical Institute, PO Box 800, 9700 AV Groningen, The Netherlands
| | - M Mevius
- ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands
- Kapteyn Astronomical Institute, PO Box 800, 9700 AV Groningen, The Netherlands
| | - J Moldon
- ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands
| | - M J Norden
- ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands
| | - E Orru
- ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands
| | - H Paas
- Center for Information Technology (CIT), University of Groningen, PO Box 72, 9700 AB Groningen, The Netherlands
| | - M Pandey-Pommier
- Centre de Recherche Astrophysique de Lyon, Observatoire de Lyon, 9 Avenue Charles André, 69561 Saint Genis Laval Cedex, France
| | - R Pizzo
- ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands
| | - A G Polatidis
- ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands
| | - W Reich
- Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
| | - H Röttgering
- Leiden Observatory, Leiden University, PO Box 9513, 2300 RA Leiden, The Netherlands
| | - A M M Scaife
- School of Physics and Astronomy, University of Southampton, Southampton SO17 1BJ, United Kingdom
| | - D J Schwarz
- Fakultät für Physik, Universität Bielefeld, Postfach 100131, D-33501 Bielefeld, Germany
| | - M Serylak
- Astrophysics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, United Kingdom
| | - O Smirnov
- Department of Physics and Electronics, Rhodes University, PO Box 94, Grahamstown 6140, South Africa
- SKA South Africa, 3rd Floor, The Park, Park Road, Pinelands 7405, South Africa
| | - M Steinmetz
- Leibniz-Institut für Astrophysik Potsdam (AIP), An der Sternwarte 16, 14482 Potsdam, Germany
| | - J Swinbank
- Anton Pannekoek Institute, University of Amsterdam, Postbus 94249, 1090 GE Amsterdam, The Netherlands
| | - M Tagger
- LPC2E, Universíte d'Orleans/CNRS, 45071 Orleans Cedex 2, France
| | - C Tasse
- LESIA, UMR CNRS 8109, Observatoire de Paris, 92195 Meudon, France
| | - M C Toribio
- ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands
| | - R J van Weeren
- Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138, USA
| | - R Vermeulen
- ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands
| | - C Vocks
- Leibniz-Institut für Astrophysik Potsdam (AIP), An der Sternwarte 16, 14482 Potsdam, Germany
| | - M W Wise
- ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands
- Anton Pannekoek Institute, University of Amsterdam, Postbus 94249, 1090 GE Amsterdam, The Netherlands
| | - O Wucknitz
- Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
| | - P Zarka
- LESIA, UMR CNRS 8109, Observatoire de Paris, 92195 Meudon, France
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