title: A large light-mass component of cosmic rays at 10(17)-10(17.5) electronvolts from radio observations.
abstract: Cosmic rays are the highest-energy particles found in nature. Measurements of the mass composition of cosmic rays with energies of 10(17)-10(18) electronvolts are essential to understanding whether they have galactic or extragalactic sources. It has also been proposed that the astrophysical neutrino signal comes from accelerators capable of producing cosmic rays of these energies. Cosmic rays initiate air showers--cascades of secondary particles in the atmosphere-and their masses can be inferred from measurements of the atmospheric depth of the shower maximum (Xmax; the depth of the air shower when it contains the most particles) or of the composition of shower particles reaching the ground. Current measurements have either high uncertainty, or a low duty cycle and a high energy threshold. Radio detection of cosmic rays is a rapidly developing technique for determining Xmax (refs 10, 11) with a duty cycle of, in principle, nearly 100 per cent. The radiation is generated by the separation of relativistic electrons and positrons in the geomagnetic field and a negative charge excess in the shower front. Here we report radio measurements of Xmax with a mean uncertainty of 16 grams per square centimetre for air showers initiated by cosmic rays with energies of 10(17)-10(17.5) electronvolts. This high resolution in Xmax enables us to determine the mass spectrum of the cosmic rays: we find a mixed composition, with a light-mass fraction (protons and helium nuclei) of about 80 per cent. Unless, contrary to current expectations, the extragalactic component of cosmic rays contributes substantially to the total flux below 10(17.5) electronvolts, our measurements indicate the existence of an additional galactic component, to account for the light composition that we measured in the 10(17)-10(17.5) electronvolt range.
authors.affiliation: Astrophysical Institute, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium.|Department of Astrophysics/IMAPP, Radboud University Nijmegen, PO Box 9010, 6500 GL Nijmegen, The Netherlands.
authors.forename: S
authors.initials: S
authors.lastname: Buitink
authors.affiliation: Department of Astrophysics/IMAPP, Radboud University Nijmegen, PO Box 9010, 6500 GL Nijmegen, The Netherlands.
authors.forename: A
authors.initials: A
authors.lastname: Corstanje
authors.affiliation: 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.|Nikhef, Science Park Amsterdam, 1098 XG Amsterdam, The Netherlands.|Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany.
authors.forename: H
authors.initials: H
authors.lastname: Falcke
authors.affiliation: Department of Astrophysics/IMAPP, Radboud University Nijmegen, PO Box 9010, 6500 GL Nijmegen, The Netherlands.|Nikhef, Science Park Amsterdam, 1098 XG Amsterdam, The Netherlands.
authors.forename: J R
authors.initials: JR
authors.lastname: Hörandel
authors.affiliation: Institute for Nuclear Physics (IKP), Karlsruhe Institute of Technology (KIT), Postfach 3640, 76021 Karlsruhe, Germany.
authors.forename: T
authors.initials: T
authors.lastname: Huege
authors.affiliation: Department of Astrophysics/IMAPP, Radboud University Nijmegen, PO Box 9010, 6500 GL Nijmegen, The Netherlands.|Department of Physics and Astronomy, University of California Irvine, Irvine, California 92697, USA.
authors.forename: A
authors.initials: A
authors.lastname: Nelles
authors.affiliation: Department of Astrophysics/IMAPP, Radboud University Nijmegen, PO Box 9010, 6500 GL Nijmegen, The Netherlands.
authors.forename: J P
authors.initials: JP
authors.lastname: Rachen
authors.affiliation: Department of Astrophysics/IMAPP, Radboud University Nijmegen, PO Box 9010, 6500 GL Nijmegen, The Netherlands.
authors.forename: L
authors.initials: L
authors.lastname: Rossetto
authors.affiliation: Department of Astrophysics/IMAPP, Radboud University Nijmegen, PO Box 9010, 6500 GL Nijmegen, The Netherlands.
authors.forename: P
authors.initials: P
authors.lastname: Schellart
authors.affiliation: KVI Center for Advanced Radiation Technology, University of Groningen, 9747 AA Groningen, The Netherlands.|Vrije Universiteit Brussel, Dienst ELEM, B-1050 Brussels, Belgium.
authors.forename: O
authors.initials: O
authors.lastname: Scholten
authors.affiliation: ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands.
authors.forename: S
authors.initials: S
authors.lastname: ter Veen
authors.affiliation: Department of Astrophysics/IMAPP, Radboud University Nijmegen, PO Box 9010, 6500 GL Nijmegen, The Netherlands.
authors.forename: S
authors.initials: S
authors.lastname: Thoudam
authors.affiliation: KVI Center for Advanced Radiation Technology, University of Groningen, 9747 AA Groningen, The Netherlands.
authors.forename: T N G
authors.initials: TN
authors.lastname: Trinh
authors.affiliation: Helmholtz-Zentrum Potsdam, Deutsches GeoForschungsZentrum GFZ, Department 1, Geodesy and Remote Sensing, Telegrafenberg A17, 14473 Potsdam, Germany.
authors.forename: J
authors.initials: J
authors.lastname: Anderson
authors.affiliation: ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands.|Shell Technology Center, 560 048 Bangalore, India.
authors.forename: A
authors.initials: A
authors.lastname: Asgekar
authors.affiliation: 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.
authors.forename: I M
authors.initials: IM
authors.lastname: Avruch
authors.affiliation: CSIRO Australia Telescope National Facility, PO Box 76, Epping, New South Wales 1710, Australia.
authors.forename: M E
authors.initials: ME
authors.lastname: Bell
authors.affiliation: ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands.|University of Twente, PO Box 217, 7500 AE Enschede, The Netherlands.
authors.forename: M J
authors.initials: MJ
authors.lastname: Bentum
authors.affiliation: Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138, USA.|Square Kilometre Array (SKA) South Africa, 3rd Floor, The Park, Park Road, Pinelands 7405, South Africa.
authors.forename: G
authors.initials: G
authors.lastname: Bernardi
authors.affiliation: Institute for Astronomy, University of Edinburgh, Royal Observatory of Edinburgh, Blackford Hill, Edinburgh EH9 3HJ, UK.
authors.forename: P
authors.initials: P
authors.lastname: Best
authors.affiliation: University of Hamburg, Gojenbergsweg 112, 21029 Hamburg, Germany.
authors.forename: A
authors.initials: A
authors.lastname: Bonafede
authors.affiliation: Leibniz-Institut für Astrophysik Potsdam (AIP), An der Sternwarte 16, 14482 Potsdam, Germany.
authors.forename: F
authors.initials: F
authors.lastname: Breitling
authors.affiliation: School of Physics and Astronomy, University of Southampton, Southampton SO17 1BJ, UK.
authors.forename: J W
authors.initials: JW
authors.lastname: Broderick
authors.affiliation: ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands.|Kapteyn Astronomical Institute, PO Box 800, 9700 AV Groningen, The Netherlands.
authors.forename: W N
authors.initials: WN
authors.lastname: Brouw
authors.affiliation: University of Hamburg, Gojenbergsweg 112, 21029 Hamburg, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Brüggen
authors.affiliation: Research School of Astronomy and Astrophysics, Australian National University, Canberra, Australian Capital Territory 2611, Australia.
authors.forename: H R
authors.initials: HR
authors.lastname: Butcher
authors.affiliation: Anton Pannekoek Institute for Astronomy, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands.
authors.forename: D
authors.initials: D
authors.lastname: Carbone
authors.affiliation: Max Planck Institute for Astrophysics, Karl Schwarzschild Strasse 1, 85741 Garching, Germany.
authors.forename: B
authors.initials: B
authors.lastname: Ciardi
authors.affiliation: Onsala Space Observatory, Department of Earth and Space Sciences, Chalmers University of Technology, SE-43992 Onsala, Sweden.
authors.forename: J E
authors.initials: JE
authors.lastname: Conway
authors.affiliation: University of Hamburg, Gojenbergsweg 112, 21029 Hamburg, Germany.
authors.forename: F
authors.initials: F
authors.lastname: de Gasperin
authors.affiliation: ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands.|SmarterVision BV, Oostersingel 5, 9401 JX Assen, The Netherlands.
authors.forename: E
authors.initials: E
authors.lastname: de Geus
authors.affiliation: ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands.
authors.forename: A
authors.initials: A
authors.lastname: Deller
authors.affiliation: Astronomisches Institut der Ruhr-Universität Bochum, Universitaetsstrasse 150, 44780 Bochum, Germany.
authors.forename: R-J
authors.initials: RJ
authors.lastname: Dettmar
authors.affiliation: ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands.
authors.forename: G
authors.initials: G
authors.lastname: van Diepen
authors.affiliation: ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands.
authors.forename: S
authors.initials: S
authors.lastname: Duscha
authors.affiliation: Thüringer Landessternwarte, Sternwarte 5, D-07778 Tautenburg, Germany.
authors.forename: J
authors.initials: J
authors.lastname: Eislöffel
authors.affiliation: Hamburger Sternwarte, Gojenbergsweg 112, D-21029 Hamburg.
authors.forename: D
authors.initials: D
authors.lastname: Engels
authors.affiliation: ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands.
authors.forename: J E
authors.initials: JE
authors.lastname: Enriquez
authors.affiliation: ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands.
authors.forename: R A
authors.initials: RA
authors.lastname: Fallows
authors.affiliation: Department of Astrophysics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, UK.
authors.forename: R
authors.initials: R
authors.lastname: Fender
authors.affiliation: Laboratoire Lagrange, Université Côte d'Azur, Observatoire de la Côte d'Azur, CNRS, Boulevard de l'Observatoire, CS 34229, 06304 Nice Cedex 4, France.
authors.forename: C
authors.initials: C
authors.lastname: Ferrari
authors.affiliation: ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands.
authors.forename: W
authors.initials: W
authors.lastname: Frieswijk
authors.affiliation: 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.
authors.forename: M A
authors.initials: MA
authors.lastname: Garrett
authors.affiliation: LPC2E - Universite d'Orleans/CNRS, 45071 Orleans Cedex 2, France.|Station de Radioastronomie de Nancay, Observatoire de Paris - CNRS/INSU, USR 704 - Université Orleans, OSUC, route de Souesmes, 18330 Nançay, France.
authors.forename: J M
authors.initials: JM
authors.lastname: Grießmeier
authors.affiliation: ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands.
authors.forename: A W
authors.initials: AW
authors.lastname: Gunst
authors.affiliation: ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands.
authors.forename: M P
authors.initials: MP
authors.lastname: van Haarlem
authors.affiliation: School of Physics and Astronomy, University of Southampton, Southampton SO17 1BJ, UK.
authors.forename: T E
authors.initials: TE
authors.lastname: Hassall
authors.affiliation: ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands.|Kapteyn Astronomical Institute, PO Box 800, 9700 AV Groningen, The Netherlands.
authors.forename: G
authors.initials: G
authors.lastname: Heald
authors.affiliation: ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands.|Anton Pannekoek Institute for Astronomy, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands.
authors.forename: J W T
authors.initials: JW
authors.lastname: Hessels
authors.affiliation: Thüringer Landessternwarte, Sternwarte 5, D-07778 Tautenburg, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Hoeft
authors.affiliation: Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany.
authors.forename: A
authors.initials: A
authors.lastname: Horneffer
authors.affiliation: ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands.
authors.forename: M
authors.initials: M
authors.lastname: Iacobelli
authors.affiliation: Leiden Observatory, Leiden University, PO Box 9513, 2300 RA Leiden, The Netherlands.|National Radio Astronomy Observatory, 1003 Lopezville Road, Socorro, New Mexico 87801-0387, USA.
authors.forename: H
authors.initials: H
authors.lastname: Intema
authors.affiliation: Astronomisches Institut der Ruhr-Universität Bochum, Universitaetsstrasse 150, 44780 Bochum, Germany.
authors.forename: E
authors.initials: E
authors.lastname: Juette
authors.affiliation: Department of Astrophysics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, UK.
authors.forename: A
authors.initials: A
authors.lastname: Karastergiou
authors.affiliation: 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.
authors.forename: V I
authors.initials: VI
authors.lastname: Kondratiev
authors.affiliation: Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany.|Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, University of Manchester, Manchester M13 9PL, UK.
authors.forename: M
authors.initials: M
authors.lastname: Kramer
authors.affiliation: National Astronomical Observatory of Japan, Tokyo 181-8588, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Kuniyoshi
authors.affiliation: ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands.
authors.forename: G
authors.initials: G
authors.lastname: Kuper
authors.affiliation: ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands.|Anton Pannekoek Institute for Astronomy, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands.
authors.forename: J
authors.initials: J
authors.lastname: van Leeuwen
authors.affiliation: ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands.
authors.forename: G M
authors.initials: GM
authors.lastname: Loose
authors.affiliation: ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands.
authors.forename: P
authors.initials: P
authors.lastname: Maat
authors.affiliation: Leibniz-Institut für Astrophysik Potsdam (AIP), An der Sternwarte 16, 14482 Potsdam, Germany.
authors.forename: G
authors.initials: G
authors.lastname: Mann
authors.affiliation: Anton Pannekoek Institute for Astronomy, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands.
authors.forename: S
authors.initials: S
authors.lastname: Markoff
authors.affiliation: ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands.
authors.forename: R
authors.initials: R
authors.lastname: McFadden
authors.affiliation: Sodankylä Geophysical Observatory, University of Oulu, Tähteläntie 62, 99600 Sodankylä, Finland.|STFC Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Didcot OX11 0QX, UK.
authors.forename: D
authors.initials: D
authors.lastname: McKay-Bukowski
authors.affiliation: ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands.|Kapteyn Astronomical Institute, PO Box 800, 9700 AV Groningen, The Netherlands.
authors.forename: J P
authors.initials: JP
authors.lastname: McKean
authors.affiliation: ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands.|Kapteyn Astronomical Institute, PO Box 800, 9700 AV Groningen, The Netherlands.
authors.forename: M
authors.initials: M
authors.lastname: Mevius
authors.affiliation: School of Physics and Astronomy, University of Southampton, Southampton SO17 1BJ, UK.
authors.forename: D D
authors.initials: DD
authors.lastname: Mulcahy
authors.affiliation: ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands.
authors.forename: H
authors.initials: H
authors.lastname: Munk
authors.affiliation: ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands.
authors.forename: M J
authors.initials: MJ
authors.lastname: Norden
authors.affiliation: ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands.
authors.forename: E
authors.initials: E
authors.lastname: Orru
authors.affiliation: Center for Information Technology (CIT), University of Groningen, PO Box 72, 9700 AB Groningen, The Netherlands.
authors.forename: H
authors.initials: H
authors.lastname: Paas
authors.affiliation: Centre de Recherche Astrophysique de Lyon, Observatoire de Lyon, 9 avenue Charles André, 69561 Saint Genis Laval Cedex, France.
authors.forename: M
authors.initials: M
authors.lastname: Pandey-Pommier
authors.affiliation: ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands.
authors.forename: V N
authors.initials: VN
authors.lastname: Pandey
authors.affiliation: Department of Astrophysics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, UK.
authors.forename: M
authors.initials: M
authors.lastname: Pietka
authors.affiliation: ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands.
authors.forename: R
authors.initials: R
authors.lastname: Pizzo
authors.affiliation: ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands.
authors.forename: A G
authors.initials: AG
authors.lastname: Polatidis
authors.affiliation: Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany.
authors.forename: W
authors.initials: W
authors.lastname: Reich
authors.affiliation: Leiden Observatory, Leiden University, PO Box 9513, 2300 RA Leiden, The Netherlands.
authors.forename: H J A
authors.initials: HJ
authors.lastname: Röttgering
authors.affiliation: School of Physics and Astronomy, University of Southampton, Southampton SO17 1BJ, UK.
authors.forename: A M M
authors.initials: AM
authors.lastname: Scaife
authors.affiliation: Fakultät für Physik, Universität Bielefeld, Postfach 100131, D-33501 Bielefeld, Germany.
authors.forename: D J
authors.initials: DJ
authors.lastname: Schwarz
authors.affiliation: Department of Astrophysics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, UK.
authors.forename: M
authors.initials: M
authors.lastname: Serylak
authors.affiliation: ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands.
authors.forename: J
authors.initials: J
authors.lastname: Sluman
authors.affiliation: Square Kilometre Array (SKA) South Africa, 3rd Floor, The Park, Park Road, Pinelands 7405, South Africa.|Department of Physics and Electronics, Rhodes University, PO Box 94, Grahamstown 6140, South Africa.
authors.forename: O
authors.initials: O
authors.lastname: Smirnov
authors.affiliation: Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, University of Manchester, Manchester M13 9PL, UK.
authors.forename: B W
authors.initials: BW
authors.lastname: Stappers
authors.affiliation: Leibniz-Institut für Astrophysik Potsdam (AIP), An der Sternwarte 16, 14482 Potsdam, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Steinmetz
authors.affiliation: Department of Astrophysics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, UK.
authors.forename: A
authors.initials: A
authors.lastname: Stewart
authors.affiliation: Anton Pannekoek Institute for Astronomy, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands.|Department of Astrophysical Sciences, Princeton University, Princeton, New Jersey 08544, USA.
authors.forename: J
authors.initials: J
authors.lastname: Swinbank
authors.affiliation: LPC2E - Universite d'Orleans/CNRS, 45071 Orleans Cedex 2, France.
authors.forename: M
authors.initials: M
authors.lastname: Tagger
authors.affiliation: ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands.
authors.forename: Y
authors.initials: Y
authors.lastname: Tang
authors.affiliation: Department of Physics and Electronics, Rhodes University, PO Box 94, Grahamstown 6140, South Africa.|GEPI, Observatoire de Paris, CNRS, Université Paris Diderot, 5 place Jules Janssen, 92190 Meudon, France.
authors.forename: C
authors.initials: C
authors.lastname: Tasse
authors.affiliation: 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.
authors.forename: M C
authors.initials: MC
authors.lastname: Toribio
authors.affiliation: ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands.
authors.forename: R
authors.initials: R
authors.lastname: Vermeulen
authors.affiliation: Leibniz-Institut für Astrophysik Potsdam (AIP), An der Sternwarte 16, 14482 Potsdam, Germany.
authors.forename: C
authors.initials: C
authors.lastname: Vocks
authors.affiliation: ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands.
authors.forename: C
authors.initials: C
authors.lastname: Vogt
authors.affiliation: Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138, USA.
authors.forename: R J
authors.initials: RJ
authors.lastname: van Weeren
authors.affiliation: Anton Pannekoek Institute for Astronomy, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands.
authors.forename: R A M J
authors.initials: RA
authors.lastname: Wijers
authors.affiliation: ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands.
authors.forename: S J
authors.initials: SJ
authors.lastname: Wijnholds
authors.affiliation: ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands.|Anton Pannekoek Institute for Astronomy, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands.
authors.forename: M W
authors.initials: MW
authors.lastname: Wise
authors.affiliation: Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany.
authors.forename: O
authors.initials: O
authors.lastname: Wucknitz
authors.affiliation: ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands.
authors.forename: S
authors.initials: S
authors.lastname: Yatawatta
authors.affiliation: LESIA, Observatoire de Paris, CNRS, UPMC, Université Paris Diderot, 5 place Jules Janssen, 92190 Meudon, France.
authors.forename: P
authors.initials: P
authors.lastname: Zarka
authors.affiliation: Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany.
authors.forename: J A
authors.initials: JA
authors.lastname: Zensus